Miley Cyrus (Photo : Reuters)

According to a Grazia source, engaged Miley Cyrus feels threatened that Jennifer Lawrence is replacing her as the glamour world's "It Girl."

Miley Cyrus has been the reigning teen diva for nearly a decade now. Right from her"Hannah Montana" days, Cyrus has been a teen icon for many. She's fashionable, trendy, a successful singer, a good actress and is now one of the youngest engaged stars. However, the future Mrs. Liam Hemsworth is now afraid that there's someone else in the industry who might just replace her.  

None other than Jennifer Lawrence.

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The 19-year-old is allegedly worried that other stars could be overtaking her in Hollywood. Lawrence has been thrust into the public spotlight since landing the lead role of Katniss in "The Hunger Games" franchise.

A source told Grazia magazine, "[Miley feels] threatened by Jennifer's career and confidence. Jennifer seems to have replaced Miley as Hollywood's It girl. And now Miley seems terrified she'll replace her as Liam's girlfriend too. That's when she started working out so much and the weight dropped off. Miley's had to grow up fast and I guess she's worried her success could all end tomorrow. She's barely sleeping. it's very sad."

This is not the first time Cyrus has been insecure of where she stands with Hemsworth. Previously her insecurities centered on young actress Emma Roberts.

Cyrus was not very pleased when Roberts walked onto the set of "Empire States" and bragged about being single and ready to mingle. Roberts plays the love interest of Cyrus's fiancé Hemsworth in the upcoming film and Cyrus reportedly was not very happy with the on-screen canoodling.

"Miley's become super-protective since she and Liam got engaged," an insider revealed to Celeb Gather. "She's worried that while he's off making movies with hot women, he'll be tempted to cheat. And it didn't help that Emma showed up on set declaring that she is single and ready to mingle."