1. Claire Danes behind Lena Dunham.
2. Rod Stewart.
3. Zach Braff.
4. Maisie Williams.
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5. Beyoncé.
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OK, OK, so it turned out to not be a photobomb after all, but we're still including it because it's an awesome photo.
6. Aaron Paul with Bryan Cranston. Amazing.
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7. George Clooney.
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8. Beyoncé strikes again.
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9. Kevin Spacey while out on a run.
10. Selena Gomez behind Joseph Gordon-Levitt.
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11. But he got his own back at the Oscars.
12. Emma Stone and James Corden behind Andrew Garfield.
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13. Kelly Clarkson behind Portia De Rossi and Ellen DeGeneres.
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14. But Bill Clinton did it back to her.
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15. Beyoncé strike three.
16. Joe Jonas.
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17. Donald Faison and Zach Braff again.
18. Cara Delevingne behind Miranda Kerr.
19. Paris Hilton behind David Beckham.
20. Some guy photobombing Neil Patrick Harris.
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21. Then he did it to Ian Somerhalder.
22. Kevin Spacey mark two.
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23. Tom Cruise tries to get in on the Edge of Tomorrow cast picture.
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24. Tyler the Creator behind Donald Trump.
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25. Jesse Tyler Ferguson ruins Orlando and Miranda's picture.
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26. Joshua Jackson and Anne Hathaway.
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27. Professor X photobombing Wolverine.
28. And Jennifer Lawrence behind Sarah Jessica Parker.
