Liam Hemsworth and Laura Dern Making Out in L.A. for Netflix Movie

Liam Hemsworth is clearly over Miley Cyrus, and the evidence is compelling -- locked in a passionate kiss with Laura Dern -- EXCEPT, it's just a movie!

The 32-year-old stud and the 55-year-old ageless beauty were filming "Lonely Planet" in downtown LA. Imagine driving down a street and seeing these 2 making out ... kind of awesome, until you realize it's all for Netflix.

Liam's been taking heat lately from ex-wife Miley, who recently dropped "Flowers" on his birthday, seemingly shading him.

Liam's been mum over the song ... probably because his mouth is otherwise engaged.