Brooke Burke was among the celebrities celebrating April Fool's Day yesterday, claiming to be pregnant for the fifth time. The Dancing With the Stars co-host didn't let the joke ride for too long; early in the afternoon she tweeted, "April Fools Tweetie pies!!!!! But seriously!!!!! I am not preggers. . . where is your sense of humor?!? I will not be Dancing With baby #5. lOL Got you!!!! April Fools!!!"

Brooke, who originally posted the news on ModernMom.com, added, "the joke was over when my MOM called me at my office to ask if I am Pregnant! The answer is a big Fat NO!. . . just because I have 4 kids, and I'm crazed...doesn't mean I don't have a sense of humor!!!"

Elsewhere on the celebrity April Fool's radar -- E! reported that sources (not Summit Entertainment) claimed that Twilight's Breaking Dawn is going to be rated R for gore and NTL for No Taylor Lautner; and, directed by Robert Pattinson.

So You Think You Can Dance's Nigel Lythgoe tweeted that Simon Cowell and Paula Abdul would be two of the revamped show's "all-star partners." He later said, "Yes, I know. You all guessed that Paula and Simon were April Fool spoofs."