AceShowbiz -

Miley Cyrus and her fiance Liam Hemsworth have reportedly broken up again. Split rumor is not something new for the young couple, but a source tells Us Weekly that "they are definitely over" this time.

A few days ago, the former "Hannah Montana" star and the Aussie hunk were reported kissing at a party in her house. But even then, a report suggested the couple was sleeping in separate rooms in the house they shared.

"(Miley) stays in the master bedroom and Liam stays in one of the guest rooms," a source told Life & Style. "Sometimes she'll even stay at her parents', which is across the street, with her sister or mom so she doesn't feel alone."

Miley, 20, and Liam, 23, dated on and off since meeting on the set of their movie "The Last Song" in 2009. He proposed to her in the backyard of her house in June 2012, presenting her with a 3.5-carat Neil Lane engagement ring.

They have rarely been seen together in the past few months as he's busy filming his new movies and she's occupied with her task of finishing her new album. She even ditched her engagement ring early this year, but later put it back on.

Amidst the escalating breakup rumors, Liam jetted off to his home country of Australia to spend time with his family. In a heart-to-heart conversation with him, his brothers Luke and Chris Hemsworth reportedly told him "to end the romance for good."