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We were wondering why Miley Cyrus rolled solo to the Elton John Oscar viewing party the other night!

While there are always rumors that she's on the rocks with fiance Liam Hemsworth, after watching this video of Liam and January Jones together at a pre-Oscar party over the weekend, we have to wonder if there might be some truth to it this time.

The 23-year-old Hunger Games hottie and the 35-year-old Mad Men beauty reportedly got "hot and heavy" at the Chateau Marmont last weekend in West Hollywood, and they were even photographed leaving in the same car!

It looked like they had some hot chemistry,” an eyewitness at the event tells Star Magazine. “They were all over each other – and they even kissed!”

“Liam got January’s coat and helped her put it on, then they headed outside. They made sure to leave a few seconds apart, so they wouldn’t attract too much attention. Then they jumped into a waiting car and took off,” the source added.

According to another source for the mag, Miley “was all over the place” at Elton John’s bash the next night. “She certainly gave off the impression that she’s single. Someone even asked her how Liam was doing, and she said she doesn’t care how he’s doing!”

Miley was also acting unattached earlier this month at New York Fashion Week. ”She was flirting with every guy and girl in sight, especially the models,” an insider tells the mag. “Miley is not the girl Liam fell in love with. She’s turned into an embarrassment."