Is it a case of over and out for Miley Cyrus and Liam Hemsworth? From the looks of it, the cute couple could be dunzo. After dating for three years, The Last Song co-stars got engaged last year, but a trip down the aisle might not be in the cards for the twosome. While it appeared that everything was going smoothly for Cyrus and Hemsworth, there is supposedly trouble on the horizon as reports surfaced that the 23-year-old Hunger Games actor was spotted making out with Mad Men leading lady January Jones at the Chateau Marmont. Jones and Hemsworth supposedly kissed and bailed from the popular hotspot to go to a private house party where they were then seen "openly making out." At least that's what eyewitnesses told Star magazine. While Hemsworth allegedly painted the town red with the blond bombshell, the former Hannah Montana star was partying with her mom at the Elton John AIDS Foundation party. Despite the rumors, Cyrus maintains that it's all a bunch of lies. Before quitting Twitter, she whined, "I am so sick of LA and sick of the lies that come with it. I didn’t call off my wedding. Taking a break from social media. #draining." She followed up Tweeting, "not discussing anything but my music from now on." Us Weekly is already reporting that the wedding if off. One source told the magazine, "Liam and Miley are done. Miley put her career on hold to spend all her time on Liam. Now that she’s back recording her fourth album, he’s not happy. She says she’s over it." Although her lips aren't moving, her engagement ring was missing from her finger Wednesday night. This just hours after the denials on Twitter.