Jon Gosselin pulled out a gun ... when a female paparazzo tailed him back to his house -- and opened fire. Jon says it was just a warning shot, but did he overreact? Plus, Kim Kardashian's first night back on the party scene since having her baby -- and it's a HUGE one. She and Kanye partied with R. Kelly, Brian Grazer, Mick Jagger, and ... OPRAH!! And, Backstreet Boys singer Brian Littrell gets some revenge on TMZ -- he joins us to show off his massive home in Georgia ... after we poked fun at him for his pint-sized digs in LA!