Bradley Cooper stars in the hilarious new flick "The Hangover," about a guy living it up in Las Vegas for his bachelor party -- before things get out of hand! "Extra" caught up with the comedic stars in Sin City, where they were candid about their love lives.

Watch Kylie Jenner's Amazing Pregnancy Video Diary
Kylie Jenner decided to keep her pregnancy to herself, but now that her "healthy baby girl" is here, she has released a long…
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