Margot Robbie attended the Australian premiere for her new movie I, Tonya, and the first thing we noticed? Her dress. The Aussie actress wore a slinky, white gown by Australian designer Michael Lo Sordo. Hanging from fine spaghetti straps and featuring a low-cut back and thigh-high split, the dress ..

Ronda Rousey is slamming the door on rumors she'll make her official WWE debut at the Royal Rumble on Jan 28 -- telling TMZ Sports it'll be physically impossible ... 'cause she'll be out of the country! "I'm actually leaving to Colombia right now…

EXCLUSIVE Paris Hilton's fiance is falling in line, and he's damn happy to do so ... at least when it comes to planning their wedding. P and Chris Zylka were at LAX Wednesday -- jetting off to some fabulous location, we're sure -- and, for once, we got HIS take on how their big day ..

HALLELUJAH!! Tim Tebow is headin' back to baseball! The ex-football superstar tells TMZ Sports he's going to accept his invite to the NY Mets spring training in February ... and he's swingin' for the fences. Tebow -- who played…

Vince McMahon is makin' a HUGE announcement at noon PT -- and all signs point to the return of the XFL ... and we'll be live streaming the announcement here. There's been a lot of talk about Vince's short-lived pro football league -- and we've…