1. Claire Danes behind Lena Dunham.
2. Rod Stewart.
3. Zach Braff.
4. Maisie Williams.
5. Beyoncé.
n-uumb.tumblr.com
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.
Kevork Djansezian / Getty Images
7. George Clooney.
Larry Busacca / Getty Images
8. Beyoncé strikes again.
9. Kevin Spacey while out on a run.
10. Selena Gomez behind Joseph Gordon-Levitt.
MTV / Twitter
11. But he got his own back at the Oscars.
12. Emma Stone and James Corden behind Andrew Garfield.
Joseph Marzullo/WENN.com
13. Kelly Clarkson behind Portia De Rossi and Ellen DeGeneres.
Christopher Polk / Getty Images
14. But Bill Clinton did it back to her.
ABC
15. Beyoncé strike three.
16. Joe Jonas.
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.
CBS
21. Then he did it to Ian Somerhalder.
22. Kevin Spacey mark two.
Dimitrios Kambouris/VF13/Contributor
23. Tom Cruise tries to get in on the Edge of Tomorrow cast picture.
Kevin Winter / Getty Images
24. Tyler the Creator behind Donald Trump.
Twitter
25. Jesse Tyler Ferguson ruins Orlando and Miranda's picture.
Brian To/WENN.com
26. Joshua Jackson and Anne Hathaway.
Marion Curtis/Startraksphoto
27. Professor X photobombing Wolverine.
28. And Jennifer Lawrence behind Sarah Jessica Parker.
