Nicole Richie Hillary Duff Feud

NICOLE RICHIE flips her lid in jealous rage – sources.

Jealous reality television star Nicole Richie has a warning to send to hubby Joel Madden’s ex, Hilary Duff: “Stay away from my man!”

Former Disney cutie Hilary, 27, recently hinted that she lost her virginity to the Good Charlotte rocker after she began dating him at the young age of 16.

“I had a 26-year-old boyfriend,” Hilary said in an interview.

“So everyone can make their own assumptions about what I was doing.”

Now a mom to 3-year-old son Luca, Hilary is separated from her hubby, former NHL player Mike Comrie.

She recently flaunted her bikini body on vacation in Mexico, and posted a selfie of herself in a sexy bathing suit on Instagram.

“Nicole is convinced that Hilary is taunting her, and she’ll make a play to win Joel back,” an insider told The National ENQUIRER.

“She’s on high alert – even doing random text and voice message checks of Joel’s phone to make sure he and Hilary aren’t communicating.

 “Nicole’s biggest fear is that Joel will dump her for another woman, so she took matters into her own hands.

“She had a mutual friend, whose son goes to the same celebrity baby music class as Hilary’s son, confront Hilary.

“The friend reminded Hilary that while Joel might not be happily married, he’s still most definitely married.”