Good thing Liam Hemsworth is just acting!

Miley Cyrus' fiance, who happens to be shirtless, is getting hot and heavy with his Love and Honor co-star Teresa Palmer.

The film is described on IMDB as the following: "When a young soldier in Vietnam (Austin Stowell) gets dumped by his hometown girl (Aimee Teegarden), he and his best friend (Hemsworth) decide to go AWOL and return to the States to win her back."

Good thing Miley and her svelte yoga body are extremely secure!