Rita Ora Cheated on Rob Kardashian With Jonah Hill!

Celebrity News Dec. 21, 2012 AT 8:30AM

One person who isn't amused by Jonah Hill: Rob Kardashian. A source tells Us Weekly that Kardashian, 25, dumped singer Rita Ora because he learned she had hooked up with the actor!

PHOTOS: Cheating scandals of 2012

"Rita spent the night with Jonah during a trip to New York," the insider says of the British "How We Do" singer and the newly-single Moneyball actor, 29. Find out how Kardashian discovered Ora's betrayal (after nearly a year of on-and-off dating) in this week's Hot Stuff video, as explained by Us Weekly Senior Editor Ian Drew and special guest, reality star Nyasha Zimucha, who's now launch a new website, embraceyourhair.com.

Rita Ora and Jonah Hill
Rita Ora and Jonah Hill
Credit: Dave M. Benett/Getty; Jason LaVeris/FilmMagic

PHOTOS: Kardashian family Christmas cards through the years

Also in the roundup? More on pregnant Duchess Kate's holiday plans with Queen Elizabeth -- who invited her parents in a royal first; how Melissa Gorga's new book deal will get Teresa Giudice's goat; details on Christina Aguilera's 32nd birthday bash, and more!

Watch the video now.

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