02/03/2014 05:37 pm ET Updated Feb 03, 2014

Celebrities' On-Air Laughing Fits Send Us Into Hysterics

Have you ever laughed so hard that you just physically couldn't stop? Ever had it happen to you on-air?

We can't help but laugh along with these six celebrities as they giggle their way through their interviews. The most endearing part? Watching them struggle to keep a straight face.

Warning: The videos below may be contagious. There's a risk that you will start to laugh so hard that you'll be unable to control it.

Anderson Cooper usually keeps it cool when reporting the news, but not this time. His giggling is so adorable, we don't ever want it to stop! (Yes, this really happened on live television.)

Tom Cruise's laughing fit on "The Late Show With David Letterman" gives us yet another reason to love him. As if we needed it ... There's nothing better than watching Roger Federer on the court. That is, of course, unless you're watching him laugh uncontrollably while being interviewed in Spanish. Prepare to swoon.

Apparently, Britney Spears and the tennis pro have more in common than one would think. When another language is involved, they just can't keep it together.

Below is Emma Watson's cutest moment of all time. Even cuter than little Hermione Granger in "Harry Potter and the Philosopher's Stone." Joe Biden laughs at himself (or an impersonation of himself) and it's hilarious.


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