Hef celebrated the big 8-0 with a classic bash at the Playboy Mansion. Celebrities including Donald Trump, Oliver Stone and Paris Hilton stopped by his front-and-center table to offer best wishes to the birthday boy. Oscar heroes Three 6 Mafia brought down the house with a live set and a special birthday tribute. And girlfriend Bridget capped off the evening with a bang, popping out of a giant cake to give her man a sexy birthday striptease. A happy 80th birthday? That's the understatement of a lifetime.