Miley Cyrus was "insanely jealous" about ex-fiancé Liam Hemsworth's "Hunger Games" co-star relationship with Jennifer Lawrence, Fashion and Style reports, leaving many fans wondering if it could have led to their split.

 "Liam kept telling Miley how great Jennifer was, so that got her back up. Then, when they met, Miley felt like Jennifer focused all her attention on Liam and made no effort with her," a source told Heat magazine, according to the site.

This was shortly after Liam Hemsworth mentioned in an interview with Good Morning America that "Jennifer has a big heart; she's amazing, she's great."

Miley Cyrus and Kellan Lutz "are having fun together" and have "amazing chemistry," despite the "Hunger Games" star denying rumors they are dating, leaving many wondering if their love affair could have led to the "Wrecking Ball" singer's split with Liam Hemsworth.

"They are both spontaneous, fun people, so their personalities match," a source close to Miley Cyrus said, according to PerezHilton.com.

"They are having fun together. They have very similar outlooks. I am not sure if it has a future but they have great chemistry so for the time being they are just having fun."

The couple was spotted making out at a Las Vegas party last month and "didn't seem to care who was watching," an eyewitness told E Online.

"It wasn't a secret that they were together."

Miley Cyrus posted several messages on Twitter before 2013 ended about memories she shared with Liam Hemsworth, leaving many fans wondering if she regrets her split with the former "Hunger Games" star.

"What about that night we laid by the fire and listened to The Cardigans all night long..... good times," she wrote in one message.

"So many good memories made this year."