Miley Cyrus and Liam Hemsworth
Miley Cyrus is happy that Liam Hemsworth has moved on in his love lifeReuters

American singer/actress Miley Cyrus is reportedly not upset that her former fiancé Australian actor Liam Hemsworth, is rumoured to be dating his Independence Day: Resurgence co-star Maika Monroe.

According to Us Weekly, the 25-year-old Hunger Games actor and the 22-year-old It Follows star were spotted getting close at a Fourth of July party thrown by director Roland Emmerich.

"His hand was on her butt as she was grinding into him and they were making out at the bar," a source said. "Liam was draped all over her. It was so PDA and in-your-face!"

However, the pair are supposedly taking things slow.

"They're not official," the insider added. "But their chemistry is ridiculous!"

According to a report in Hollywood Life, the 22-year-old We Can't Stop singer is happy that Hemsworth has moved on in his love life.

Cyrus, who recently came out as bisexual, is dating Victoria's Secret angel Stella Maxwell.

"Miley heard about them hooking up and she has no problem with it. She thinks Maika's hot — she's like, 'High-five, Liam!' And Miley's busy with Stella right now, so she's not worrying about it," a source said.

Jennifer Lawrence's best friend and Cyrus met on the set of the Nicholas Sparks film The Last Song, in 2009. In 2012, Hemsworth proposed to the former Disney star with a 3.5-carat Neil Lane diamond ring.

The couple made their last public appearance together at the premiere of his film Paranoia at the DGA Theater in Los Angeles, before Hemsworth officially announced his split from the Wrecking Ball singer.