Miley Cyrus and Liam Hemsworth Split Because of 'Wrecking Ball' Singer's MTV VMA Performance?

Liam Hemsworth broke up with Miley Cyrus because he was embarrassed and disgusted with her, Radar Online reported Tuesday.

On Monday, representatives for the Wrecking Ball singer and the Hunger Games actor ended their year long engagement. They had been dating on and off for four years, becoming engaged in 2012. Sources said that Cyrus' recent antics were the final straw.

Cyrus drew controversy with her performance at the MTV Video Music Awards. She twerked non stop, gyrated against Robin Thicke and used a foam finger suggestively. The 20-year-old has been unapologetic about her antics but Hemsworth was allegedly mortified by her behavior.

"Miley and Liam were already pretty much broken up at that point, but when he saw her performance and the backlash it created, it was the nail in the coffin," a source said.

Apprently, Cyrus' lewd gestures during the performance was the impetus he needed to break it off with Cyrus.

"He was embarrassed, disgusted and mortified by her performance," a source said.

Other sources previously said that the actor was encouraged to dump Cyrus. His handlers felt she reflected poorly on him.

"Liam is a serious actor with a growing career, while Miley has just turned into a joke," the source said.