Uh oh. It's no secret that Miley Cyrus likes to party, seeing as its gotten her into some trouble in the past. But now it may be getting her into trouble with her boyfriend, 'The Hunger Games' star Liam Hemsworth.

Us Weekly reports that Cyrus' habits are making her Aussie man a little uncomfortable. "She gets pretty crazy," a source told the mag.

A refresher: Cyrus was recently photographed leaving a marijuana dispensary, was infamously caught on video smoking salvia and has admitted (then backpedaled from) to being a stoner. So what antics actually worry Hemsworth?

"She's always out in skimpy outfits and writhing on Liam," the source dished. "Sometimes he looks embarrassed for her." Yikes! Considering Cyrus may have been nervous about losing her man to fame, this can't be helping matters. The source added that while Hemsworth loves the 'Can't Be Tamed' singer's "fun-loving side ... He gets concerned too."

We're guessing he wasn't thrilled about that penis cake, either. But we're willing to give the former 'Hannah Montana' starlet the benefit of the doubt. Just like Hemsworth had to lose weight to play Gale, maybe Cyrus is just staying in character for her part in 'LOL.'