Liam Hemsworth mortified by Miley Cyrus` antics?

Los Angeles: Pop star Miley Cyrus` controversial performance at the MTV Video Music Awards reportedly left her fiancé Liam Hemsworth `mortified` and unsure about the future of their relationship.

The `We Can`t Stop` hitmaker danced on stage with Robin Thicke in a flesh-coloured bikini during a rendition of his single `Blurred Lines` at the event and her fiance is said to be `embarrassed` by her antics, reported Radar online.

"Liam really does care about Miley, but her racy new look and sort of ghetto attitude isn`t exactly what he signed up for. Her VMA performance absolutely mortified him and he couldn`t be more embarrassed. He doesn`t really see anything sexy about what she did on stage," a source said.

Their relationship could be coming to an end with the `Hunger Games` actor growing disillusioned with her wild behaviour.

"It`s pretty much over. He knows he can`t stay with her when this is who she`s become ... He doesn`t want to babysit her anymore. He has to move on," the source said.

Hemsworth`s team is apparently pushing him to end their romance because they fear it will damage his career.

"It`s not just Liam that Miley is pushing away ... His entire team is urging him to part ways with her because she`s nothing but negative for his reputation and career. Liam is a serious actor with a growing career, while Miley has just turned into a joke," it added.