Miley Cyrus -- Speaking in Tongues

12/11/2009 8:05 AM PST

Miley Cyrus -- Speaking in Tongues

Miley Cyrus went to Paris last night ... and wound up in a French kiss.

Instead of eating a delicious Nutella crepe, the 17-year-old opted to stuff this mystery dude into her mouth instead.

And with that, Justin Gaston faded away even further into obscurity...

We're told the dude is Liam Hemsworth -- one of Miley's co-stars in some movie she's doin.

So the next question is -- is this kiss for real ... or for publicity?