Miley Cyrus iHeartRadio Music Festival: 'Wrecking Ball' Singer Cries During Performance Because Liam Hemsworth Moved On Publicly With Eiza Gonzalez? (WATCH)

Miley Cyrus' first performance post Liam Hemsworth split was filled with tears; the singer is rumored to be "disgusted" and "hurt" that her former fiancé could move on so quickly.

Cyrus' iHeartRadio Music Festival performance of her hit single "Wrecking Ball" was an emotional one for her singers. She wiped away her tears, choking back her sobs to get through the song, which many have speculated to be about Hemsworth.

A day after Cyrus and Hemsworth announced their split, the "Hunger Games" Actor was photographed kissing rumored rebound Mexican actress Eiza Gonzalez.

HollywoodLife.com reports Cyrus' is putting up a front and is actually hurt and angry her former flame could be so publicly.

"She feels like she doesn't know him anymore," a source close to Miley told the gossip site. "She's pretty shocked that he would be so public with Eiza."

Hemsworth reportedly met Gonzalez while hanging out in Las Vegas. Rumor has it the actor didn't want to be photographed with Cyrus in public. The singer at one point deleted her Twitter account, and many speculated it was due to Hemsworth not wanting her to talk about their relationshiop.

"It's even more insulting because he's been on this soapbox about keeping things private, that's why they never had pictures taken," the insider added. "Now he's breaking his own rules. If he's trying to hurt her it's working, but it's also making him look like a hypocrite."

"It's very hurtful that Liam's just moved on and isn't even trying to hide it," the same source told us. "Miley's putting up a good front and trying to play it off like she doesn't care but she's really f'ed up over this."

HollywoodLife.com also reports Hemsworth was attracted to Gonzalez because she reminds him of the "Old Miley."

"All Miley's friends are telling her that Eiza looks like an imitation of her - well, the old version of her before she cut her hair," a source told the gossip site. "Eiza looks so much like the old Miley, the way she was back when she and Liam first fell in love."

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