Miley Cyrus reportedly had a "complete breakdown" backstage following her tearful performance of new track Wrecking Ball at the iHeart Radio Music Festival, a new report has claimed.

The 20-year-old was said to be incredibly emotional after seeing images of ex-fiance Liam Hemsworth kissing Mexican beauty Eiza Gonzalez just two days after officially confirming a split.

According to eyewitnesses, the former Disney star ran to her mother and hugged her after the number -- and the emotional breakdown continued backstage.

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"She really lost it," an eyewitness told Life & Style. "She was hysterical crying. There were a lot of tears."

As EnStars reported, Hemsworth moved out of the Toluca Lake, Calif., home he shared with her before they announced their split.

Before the couple had officially called off their engagement, Hemsworth was spotted partying in Las Vegas with Eiza Gonzalez, a 23-year-old actress and singer.

Then, a steamy snap obtained by E! News showed the pair locking lips outside her Beverly Hills apartment.

The hunk reportedly stopped by Gonzalez's home around 3:30 p.m. to give her a piece of luggage, possibly one left at his house after they reportedly spent the night together following a rendezvous in Las Vegas last weekend.

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Miley Cyrus, Liam Hemsworth