Matt Bellamy -- Blurs Lines with Kate Hudson Look-Alike

Matt Bellamy jumped from Kate Hudson to her doppelganger -- who starred in the "Blurred Lines" video -- but we've learned he's just friends with the leggy model/actress.

Her name is Elle Evans -- and you'd probably know her better with her clothes off ... as she was in the uncensored version of Robin Thicke's hit music vid.

The Muse singer and Evans were photographed on Oscar night -- but sources close to the situation tell us it was no romantic dinner date. They were leaving Craig's with about 10-12 other friends. We're told Sunday was the first time they'd hung out together.

Guess she's just a good girl ...