Miley Cyrus Engagement Off: Liam Hemsworth Cheats And Kisses January Jones Kisses At Oscar Party, Mad Men Star Has Liam Madly In Love?

Miley Cyrus and Liam Hemsworth may never make it down the aisle after all. The handsome hunk who proposed to his "Hannah Montana" girlfriend in June 2012 is straying outside the relationship with "Mad Men" co-star January Jones- kissing her!

The two were seen at a pre-Oscar party in Los Angeles over the weekend and seemed to have a flirting session the whole night, according to Star magazine. Hemsworth showed up to the Chateu Marmont hotel alone and began getting close to the actress, "It looked like they had some hot chemistry," a source told the magazine. "They were all over each other - and they even kissed!"

In the March issue of Comopolitian Cyrus gushed about being the luckiest woman on earth finding the love of her life. In magazine the starlet accidentally reveals that she's happy to be married, "I know, right? I'm happy I don't have to date anymore though. All my friends are guys, so I hear the sh*t guys say about dating. One guy called me and said, 'Miley, I don't know what to do - this girl won't leave my house. It's 6:00 and I have a blind date at 6:30.' And I was like, 'I'm so happy I'm married, because you guys are cruel!' It's hard to find a good guy, and all girl know that guys don't think with their brains."

Did Hemswoth break his vows?