CHEATER: Liam Hemsworth CAUGHT Kissing Mystery Blonde

The usually dependable Radar is reporting Liam Hemsworth was in some hot mouth on mouth action with a mystery blonde last week!

Despite giving the Hannah Montana star a sparkling Neil Lane engagement ring in June, it seems that the Aussie actor may not be quite ready to settle down just yet, as he was spotted getting “very cozy” with a hot blonde at a Hollywood party last week, and RadarOnline.com has the exclusive details.

Hemsworth attended the Samsung Galaxy Note II party at a private home in Beverly Hills on October 25, with his fiance nowhere in sight, but apparently the 22-year-old wasn’t too bothered by her absence!

An eyewitness tells Radar exclusively that Liam, who arrived early at the tech savvy party and stayed until the end, spent the majority of the night chatting up a beautiful blonde woman in the back tent, and it wasn’t Miley!

“Liam was in the corner of the back tent with a blonde and they were getting very cozy,” the source dishes. “It definitely looked like they were behaving in a way that was more than just friendly.”

According to the source, Liam wasn’t being secretive about his one-on-one with the mystery blonde, despite several industry people and fellow actors standing and sitting close by.

“His friend/handler was trying to keep people away and allow Liam and his ‘friend’ some privacy,” the source adds, “but Liam didn’t seem to be that worried about it.”

Liam headed back to Atlanta on October 31, where he is currently filming the second installment of The Hunger Games franchise.