Taylor Swift - You Belong With Me (Live on Letterman)

Music video by Taylor Swift performing You Belong With Me (Live on Letterman). Big Machine Records, LLC.

Taylor Swift - Speak Now (Live on Letterman)

Music video by Taylor Swift performing Speak Now (Live on Letterman). Big Machine Records, LLC.

Taylor Swift - Mine (Live on Letterman)

Music video by Taylor Swift performing Mine (Live on Letterman). Big Machine Records, LLC.

Taylor Swift - Love Story (Live on Letterman)

Music video by Taylor Swift performing Love Story (Live on Letterman). Big Machine Records, LLC.

Taylor Swift - Back To December (Live on Letterman)

Music video by Taylor Swift performing Back To December (Live on Letterman). Big Machine Records, LLC.

2010 Red Carpet Interview (American Music Awards)

Music video by Avril Lavigne performing 2010 Red Carpet Interview (American Music Awards). © Dick Clark Productions

2010 Red Carpet Interview (American Music Awards)

Music video by Miley Cyrus performing 2010 Red Carpet Interview (American Music Awards). © Dick Clark Productions

Taylor Swift - ASK:REPLY

Taylor Swift answers your questions. (C) 2010 Big Machine Records, LLC

Miley Cyrus - Who Owns My Heart

Music video by Miley Cyrus performing Who Owns My Heart. (C) 2010 Hollywood Records, Inc.

Jessica Alba's Cosmo Cover Shoot

Behind the scenes with Jessica Alba.



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Taylor Swift - Mine

Music video by Taylor Swift performing Mine. (C) 2010 Big Machine Records, LLC
#VEVOCertified on Sept. 23, 2012. <a href="http://youtube.com/VEVOCertified"

Avril Lavigne - Alice

Music video by Avril Lavigne performing Alice. (C) 2010 DISNEY ENTERPRISES, INC.

The Making of Katy Perry's "Teenage Dream" Video

Get a behind-the-scenes look at the making of Katy's new music video.



Seventeen Magazine:

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Sponsored Video: Look Picture Perfect in the Bright Prep Trend for Fall

One reader wants to stand out in pics with her friends. See how she brightens up her look to get

Sponsored Video: Look Picture Perfect in Plaid for Back to School

Seventeen reader Jazzy wants to update her Facebook pic, but that will mean a revamp of her wardrobe too. See

Sponsored Video: Look Picture Perfect in the Military Trend This Year

Follow one reader as she learns how to pull off the hot fall trend of military-inspired outfits!


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Stars of Eclipse at the Red Carpet Premiere

Check out what Taylor, Kristen, Kellan, and the rest of the Eclipse cast had to say about the latest Twilight

Hot Guy Gallery: Liam Hemsworth

See the hottest pics of Liam Hemsworth in under a minute!



CosmoGIRL Video:

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Hot Guy Gallery: The Guys of The Vampire Diaries

See the hottest pics of Paul Wesley, Ian Somerhalder, Zach Roerig, Steven R. McQueen, and Michael Trevino from The Vampire

Hot Guy Gallery: The Guys of Glee

See the hot guy cast members of Glee (Cory Monteith, Chris Colfer, Kevin McHale, Mark Salling)!



CosmoGIRL

Jenna Ushkowitz Searches For The Perfect Dress

Follow around the Glee star as she tries to find a cute dress and pair of heels for the FOX

Eclipse Cast Superlatives

Charlie Bewley, Michael Welch, Alex Meraz and Kiowa Gordon talk about the rest of the members of the Twilight Saga:

Eclipse Guys Photo Shoot

Go behind the scenes of the guys of Eclipse photo shoot and hear from Charlie Bewley, Michael Welch, Alex Meraz

TeenNick Degrassi Trailer

TeenNick Degrassi Trailer



CosmoGIRL Video:

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CosmoGIRL Magazine:

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Hellcats

Take a look at the new CW show Hellcats, coming Wednesdays this Fall!



CosmoGIRL Video:

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Boys Like Girls Play the Ultimate Prom!

When rockstars show up at a small-town prom, a regular school dance turns into the best night ever!

<br

omggirlz

omggirlz



CosmoGIRL Video:

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CosmoGIRL Magazine:

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Miley Cyrus - Can't Be Tamed

The official music video from Miley Cyrus performing "Can't Be Tamed." © 2010 Hollywood Records, Inc.
#VEVOCertified on Nov.

Artist vs. Poet

Exclusive Artist vs. Poet video.



CosmoGIRL Video:

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CosmoGIRL Magazine:<br

Exclusive Original Dirty Dancing Clip

Lionsgate offers CosmoGirl! a sneak preview at an exclusive clip of 1987's timeless classic, Dirty Dancing. Here, Patrick Swayze and

Twilight: Eclipse Trailer 2

Twilight: Eclipse Trailer 2



CosmoGIRL Video:

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CosmoGIRL Magazine:
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Avril Lavigne - Losing Grip

Music video by Avril Lavigne performing Losing Grip. YouTube view counts pre-VEVO: 7,354,746 (C) 2003 Arista Records, Inc.

Learn How to Add Hair Extensions at Home!

Follow these easy steps to switch up your hairstyle without paying major money at a salon!



CosmoGIRL

Go Behind the Scenes of an Agatha Ruiz de la Prada Fashion Show in Mexico!

Hear an interview with the designer and see what her collection was all about!



CosmoGIRL Video:
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Twilight: Eclipse Trailer

Twilight: Eclipse Trailer



CosmoGIRL Video:

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CosmoGIRL Magazine:

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Twilight: Eclipse Teaser Trailer

Watch a ten second teaser trailer for Twilight: Eclipse starring Robert Pattinson, Kristen Stewart, and Taylor Lautner.


<br

Avril Lavigne - I'm With You

Music video by Avril Lavigne performing I'm With You. YouTube view counts pre-VEVO: 23,850,982 (C) 2002 Arista Records, Inc.

Avril Lavigne - Nobody's Home

Music video by Avril Lavigne performing Nobody's Home. YouTube view counts pre-VEVO: 12,477,306 (C) 2004 Arista Records, Inc.

Avril Lavigne - Don't Tell Me

Music video by Avril Lavigne performing Don't Tell Me. (C) 2004 Arista Records, Inc.

Avril Lavigne - My Happy Ending

Music video by Avril Lavigne performing My Happy Ending. YouTube view counts pre-VEVO: 8,777,587 (C) 2004 Arista Records, Inc.

Avril Lavigne - Sk8er Boi

Music video by Avril Lavigne performing Sk8er Boi. YouTube view counts pre-VEVO: 1,168,232 (C) 2002 Arista Records, Inc.

Go Retro Chic

Makeup tips from the Spring 2010 Badgely Mischka show.



CosmoGIRL Video:

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Try a Fashion-Forward Pompadour

Hair how-tos from the Spring 2010 Tracy Reese show.



CosmoGIRL Video:

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<br

Taylor Swift - Fearless

Music video by Taylor Swift performing Fearless. (C) 2010 Big Machine Records, LLC.

Flaunt Glam Waves

Hair secrets from the Spring 2010 Carlos Miele show.



CosmoGIRL Video:

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Get Your Go-To Daytime Look

Makeup looks from the Spring 2010 Carolina Herrera show.



CosmoGIRL Video:

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Beachy Skin and Bitten Lips

Makeup tips from the Spring 2010 Brian Reyes show.



CosmoGIRL Video:

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<br

Get Red Splashed Eyes and Lips!

Makeup tips from the Betsey Johnson Spring 2010 show.



CosmoGIRL Video:

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Rock a Futuristic Hair Knot

Hair tricks from the Spring 2010 Badgely Mischka show.



CosmoGIRL Video:

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<br

Avril Lavigne - Complicated

Music video by Avril Lavigne performing Complicated. YouTube view counts pre-VEVO: 21,200,158 (C) 2003 Arista Records, Inc.

Miley Cyrus - When I Look At You

Music video by Miley Cyrus performing When I Look At You. (C) 2010 Touchstone Pictures

Rachel Vincent Talks Prom

Rachel Vincent, author of My Soul to Save tells CosmoGirl three things you should know before going to prom.
<br

Avril Lavigne - Alice (Teaser)

Avril Lavigne - "Alice" premiering soon on VEVO!

Lauren Conrad's Cosmo Cover Shoot

Go behind the scenes with Lauren Conrad, Cosmo's July 2009 cover girl!



CosmoGIRL Video:

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Whitney Port's Cosmo Cover Shoot

Go behind the scenes with Cosmo's May 2009 cover girl!



CosmoGIRL Video:

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Katy Perry's Cosmo Cover Shoot

Katy Perry opens up about fashion, music, and more at her Cosmo cover shoot!



CosmoGIRL Video:
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Katy Perry's Fun Fearless Fashion

Katy's unique, confident style turns heads whereever she goes. Here, she reveals her fashion secrets...and where she gets her inspiration!<br

Carrie Underwood's Cosmo Cover Shoot

Hotter than ever, the superstar let's you go behind the scenes of her third Cosmo cover!



CosmoGIRL

Leighton Meester's Cosmo Cover Shoot

Go behind the scenes with Leighton Meester, Cosmo's June 2009 cover girl!



CosmoGIRL Video:

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Ashley Tisdale's Cosmo Cover Shoot

Go behind the scenes with Ashley Tisdale, Cosmo's April 2009 cover girl!



CosmoGIRL Video:

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Megan Fox's Cosmo Cover Shoot

Go behind the scenes at Megan Fox's Cosmo cover shoot!



CosmoGIRL Video:

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Marisa Miller Cosmo Cover Shoot

Go behind the scenes with Marisa Miller at her Cosmo cover shoot.



CosmoGIRL Video:

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Kat McPhee talks about Makeup Tips and her Tatas

The American Idol alum—rocking a hot, new look—shared secrets with Cosmo about her relationship and the beauty trick she now

Anna Faris's Cosmo Cover Shoot

Go behind-the-scenes of Anna's first-ever Cosmo cover!



CosmoGIRL Video:

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<br

Ashley Greene's TeenPROM Cover Shoot

Find out what Ashley has to say about her own prom experience and her advice for asking a guy to

Shirock Exclusive Performance: Calm Inside the Storm

Shirock performs "Calm Inside the Storm."



CosmoGIRL Video:

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CosmoGIRL

Shirock Exclusive Performance: I'll Take Rain

Shirock performs "I'll Take Rain."



CosmoGIRL Video:

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CosmoGIRL Magazine:<br

Shirock Exclusive Interview

Shirock talks to CosmoGirl about their music and nonprofit organization, Everything Burns.



CosmoGIRL Video:

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Alex Young Exclusive Interview

Singer Alex Young talks to CosmoGirl about how she got her start in music, her influences, and her work with