Barry Diller denies that Frank Gehry built him an invader-proof, bullet-proof bunker in the bathroom of his office at the new IAC headquarters. So Pamela and Kid didn’t break up over Borat — they broke up because Pam partied too much and left the kids home with Kid (and maybe lied about her miscarriage). New crotch-flashing best friends Paris Hilton and Britney Spears will host the Billboard Music Awards Monday in Vegas. Rush & Molloy “breaks” the news that the “raisin face” Nicole Richie was referring to on her blog is Rachel Zoe, which, like, everyone knew two days ago. Ed Koch lost his pants at an airport in Portugal. Steve Schirripa accidentally head-butted James Gandolfini on the set of The Sopranos. Bobby Kennedy Jr. had dinner with his sister’s husband’s ex-wife. The publishers of InStyle want the magazine’s weddings editor to make things a little more highbrow. Snoop Dogg filed a $2 million lawsuit against his record label for royalties owed; TomKat spent $4.75 million for a cottage in London. Robert Altman tattooed dogs for a living before he made movies. Publicist Dan Klores has a movie in Sundance this year, his third in five years. Some people laughed at a screening for a new comedy about Adolph Hitler, and some people didn’t. (And yes, the director’s Jewish.) Cindy Adams speculates (twice!) that ABC’s Primetime co-anchor John Quinones will take over Ed Bradley’s vacant seat at 60 Minutes. Liz Smith reminds us that Rudy and Judy Giuliani are truly, madly, deeply in love. Lillo Brancato, of A Bronx Tale fame, is in solitary confinement at Rikers Island for a third time (this time for heroin). And the Post scolds the Daily News for calling a kettle black.