Rihanna Dating Rob Kardashian!

Celebrity News Aug. 31, 2012 AT 12:00PM

Rihanna is keeping up with one very handsome Kardashian.

The "S&M" singer, 24, shared an action-packed day with E! reality star Rob Kardashian, 25, on August 25, multiple insiders tell the new issue of Us Weekly (out now). After go-karting at Racer's Edge Indoor Karting in Burbank, California, the pair partied at L.A.'s Playhouse nightclub later that evening.

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"They were sitting closely at the club, whispering in each other's ears and clearly flirting," an eyewitness says. A Kardashian source adds that "Rihanna and Rob have been flirting for a while."

Rihanna and Rob Kardashian
Rihanna and Rob Kardashian
Credit: Kevork Djansezian/WireImage.com; Isaac Brekken/Getty

Until recently, Kardashian was linked to a Rihanna competitor -- British singer Rita Ora, 21. Rihanna was so taken with Kardashian at Playhouse, she didn't even visiting a neighboring VIP: her ex, Chris Brown, 23!

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For more details on the stars' surprise courtship -- and how Rihanna avoided contact with Brown during her night on the town with Kardashian -- watch this week's Hot Stuff Video, as explained by Us Weekly Senior Editor Ian Drew and special guest, nightlife icon Amanda Lepore.

Also in the roundup: Kate Hudson thinks Lea Michele is a diva on the Glee set, Taylor Armstrong packs on the PDA with boyfriend John Bluher, and much more!

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