Rachel McAdams, Jenny McCarthy, Megan Fox & Paris Hilton are at the top of this week’s Celebrific Fab 4 most popular celebs according to our internal celebrity tracker and other than the fact that they’re all smokin’ hot, here’s a few fun facts about each of them that some of you may not have already known:

Rachel McAdams

Rachel McAdams. The 31 year old Canadian born actress’ big break came when she got the role of Queen Bee Regina George in the 2004 teen comedy, Mean Girls, alongside Lindsay Lohan, Lacey Chabert, Amanda Seyfried and Tina Fey.

So why is Rachel McAdams on the radar now? Because there’s a Nintendo DS Mean Girls video game coming out on April 20 and everyone seems to be wondering why Lindsay Lohan does not appear on the cover.

Jenny McCarthy

Jenny McCarthy, 1990’s Playboy Bunny turned actress, author and activist promoting claims that some vaccines cause autism, is on the Celebrific radar because her ‘marriage’ with uber-famous funnyman Jim Carrey is in the process of grinding to a screeching halt, partly because of Jim’s ongoing battles with depression.

Megan Fox

Megan Fox is on the Celebrific Fab 4 list this week because, well, she’s Megan Fox and everyone. The Transformers and Jennifer’s Body hottie has a role in the upcoming June 18 film, Jonah Hex, and is said to signed up for the lead female role in the 2011 film, The Crossing about a young couple who get tangled up with drugs while vacationing in Mexico. Oh, and Megan Fox also has clubbed thumbs.

Paris Hilton

Paris Hilton? Well, she’s on the radar all the time. The Hilton Hotels heiress just can’t stay away from the business end of the paparazzi’s lens, whether she’s wearing clothing or not.

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