Those Aussies tend to stick together -- but one big star from down under had some pretty harsh words for Rebel Wilson.

The hilarious Australian actress was a guest on "The Tonight Show" with Jay Leno on Tuesday, where she revealed one very rough run-in with the sometimes-irritable Russell Crowe.

Check out the video above to find out why he once yelled at her to "F**k off!" Ouch!

Rebel will be hosting the MTV Movie Awards this Sunday -- and last night she teased appearances from James Franco, Brad Pitt and the cast of "Pitch Perfect."

"It's pretty full-on," she says about her hosting gig. "I have to dance, I have to sing, I have to do jokes and I have to try to look hot ... that'll probably be the hardest one."

Be sure to come back to Sunday, April 14 for all the best and worst red carpet moments, plus highlights from the show.

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