Socialite Paris Hilton has fired back at British funnyman Ricky Gervais for snubbing her on the upcoming series of Extras. The hotel heiress has branded the comic genius too insecure to work with actresses of her calibre after her pleas to appear on the show, which has previously starred Ben Stiller, Samuel L Jackson and Kate Winslet, were rebuffed. She says, "I guess he's obviously scared of starring alongside an A-lister."