Miley with Pals Lil Kim and Tiffany Foxx

Miley and Liam have split.

The young pop star and actress has lost her hunky actor fiancé, and reports have claimed Hemsworth dumped Cyrus because of her partying.

The couple - who have been dating since 2009 but separated twice in 2010 - have reportedly gone their separate ways after the former 'Hannah Montana' star's partying ways became a "problem" for the 'Hunger Games' actor.

One source said: "Miley and Liam are done; it's over. She likes to party really hard and can be pretty wild. It became a problem for him."

Another source added to the New York Post newspaper: "They have broken up before, and are broken up again now. There was drama because she suspected he had a wandering eye. And she recently tweeted a denial that he cheated.

"While Miley has insisted they are still together, right now they are very, very much apart."

Liam - who proposed to the 20-year-old singer-and-actress last March - recently flew back to his native Australia to escape his problems and spend time with his brother Chris Hemsworth and the actor's family, wife Elsa Pataky and nine-month-old daughter India Rose.

A source said: "He needed to get away from Los Angeles and spend some time with his brother and friends."

However, despite the split friends close to Miley - who was recently photographed without her engagement ring - are hopeful they will reconcile their differences and reunite once again.

One pal said: "Miley is a fiery character, and they do fight, but she is crazy about Liam. She isn't ready to accept it might be over for good."

(Image: WENN)