Jason Segel & Michelle Williams, And Other Celebrity Odd Couples (PHOTOS)

01/17/2013 01:42 pm ET

Happy birthday, Jason Segel! The actor turns 33 Friday, and we'll admit we've been smitten with him since his "Freaks and Geeks" days. While Segel is not the conventional Hollywood hunk, he's charmed many ladies with his hilarious roles in movies like "Forgetting Sarah Marshall," "Knocked Up" and "I Love You, Man," and his endearing obsession with Muppets. So while they might seem an unlikely couple at first glance, we can easily understand how Segel attracted girlfriend Michelle Williams.

Here are other celebrity pairs who prove that personality goes a long way.

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