Paris Hilton Blue dress white coat pink car BFFs Brooke Mueller's house

It's birthday girl Paris Hilton! The hotel heiress is keeping busy after celebrating her 30th birthday with a Moulin Rouge-themed par-tay in Hollywood and a special appearance on the Letterman show in NYC...

Princess P, who just returned from the Big Apple with boyfriend Cy Waits, was spotted filming her latest reality show - The World According to Paris - at BFF Brooke Mueller's house in Bev Hills on Saturday. And now that the gals are finished filming, when's this sure-to-be-hit finally going to air? We're dying to see Paris back on TV regularly!