Miley Cyrus is "completely in lust" with her new boyfriend and Rolling Stone photographer Theo Wenner, HollywoodLife.com reports, leaving many fans wondering if her ex-fiance Liam Hemsworth is jealous.

"She's definitely dating him," a source told the website.

"Miley talks about how hot Theo is and how nice he's been to her. She's definitely completely in lust with him."

Miley Cyrus' hit single "Wrecking Ball" has captured the attention of fans around the world, especially for its ominous references to her relationship with ex-fiancé Liam Hemsworth, but many are left wondering how far back she wrote the song.

Rumors suggest that the couple was split up for several months before it was announced and but the final straw in their relationship was when Liam Hemsworth was left mortified after Miley Cyrus' performance at the VMAs 2013.

"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 exclusively told Radar.

"That was all he needed to finally break up with Miley once and for all. He was embarrassed, disgusted and mortified by her performance."

Liam Hemsworth's sister-in-law Elsa Pataky urged him to break up with Miley Cyrus for over a year, Radar Online also reports.

Elsa, the wife of Liam's big brother, Chris Hemsworth, "is no fan of Miley," a source close to the Hemsworth family told the website.

"She spent the last year freezing Miley out in some kind of passive-agressive move."

"Elsa is totally against Miley and Liam getting back together. Miley desperately wants to get back with Liam and believes she can because she's done it before," the source insists. "But to do that, she's going to have to win over Elsa!"