'Twilight' Star Ashley Greene -- LET'S GO WISCONSIN ... I Smell Upset!

She may be from Florida, but "Twilight" star Ashley Greene tells TMZ Sports she's pulling for the Badgers in the Final Four ... and she's got UPSET on her mind.

Greene explained why she's a fan of Wisconsin at LAX over the weekend -- and when we pointed out that Vegas odds show a UW upset over Kentucky is unlikely, she had the perfect response:

"Isn't that the fun in all of this when they do?"