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Happy Birthday to Mary-Kate and Ashley Olsen! To celebrate their big day, Fab put together an awesome slideshow of photos of the girls, while we're ready to test out your skills at telling them apart. So what do you think — can you tell the difference between Mary-Kate and Ashley Olsen? Click here to get guessing!
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1 Video: Hot Guys Saying "I Love You"
Grammy Awards
2 Adele's Sweep, a Prayer For Whitney Houston, and More 2012 Grammys Highlights
Editor's Pick
3 City Smile
Gallery
4 The Artist Has a Big Night at the BAFTAs With Brad, George, Penelope, and More
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5 Jennifer Hudson Sings a Tribute to Whitney Houston
Grammy Awards
6 20 Can't-Miss Backstage and Audience Grammys Pictures
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7 Video: Katy Perry Debuts New Song About Breakup at Grammys
Grammy Awards
8 Nicki, Carrie, Katy, and More Kick Off the Grammy Red Carpet in Style!
Celebrity Interviews
9 Courteney, Busy, and Company Take Us Behind the Scenes on Season Three of Cougar Town
Grammy Awards
10 Britney, Diddy, Kim, Miranda, and More Honor Whitney Houston at Clive Davis's Pre-Grammy Party
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11 Watch Adele's Teary Grammys Speech on "Rubbish Relationship," Snot, and More!
Gallery
12 See All the Berlin Film Festival Pictures So Far With Angelina, Diane, and Jake!
Gallery
13 David and Victoria Celebrate Her Runway Success With Harper
Gallery
14 Remembering Whitney Houston With a Look Back at Her Life in Pictures
Gallery
15 Glamorous Ladies Michelle, Viola, Christina, and Kristen Step Out For the BAFTAs
Celebrity PDA
16 Bikini-Clad Scarlett Johansson Vacations in Hawaii With Her Boyfriend
Grammy Awards
17 See All the Pictures From the Grammys Red Carpet, Show, and More
Gallery
18 David and Harper Show Their Support For Victoria Beckham at Her NYFW Presentation
Celebrity PDA
19 Jennifer Aniston and Justin Theroux Show PDA at Her Exclusive Birthday Bash
Grammy Awards
20 Jennifer Hudson Delivers Emotional Whitney Houston Tribute at the Grammys
celebrity couples
21 They Dated?! Fun Celebrity Couples From the Past!
Grammy Awards
22 Rihanna and Coldplay Rock Out With an Amazing, Sexy Grammy Performance!
Celebrity Pregnancies
23 Sienna Miller Debuts Her Reported Engagement Ring
Grammy Awards
24 Carrie, Rihanna, Katy, Fergie, and More Get Sexy on the Grammys Red Carpet
