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While her sisters were taking in the iHeartRadio Music Festival in Las Vegas, Kim Kardashian and baby daddy Kanye West were partying in L.A. with Oprah.

They hooked up at a birthday bash thrown by 60-year-old music producer Jimmy Iovine for his girlfriend Liberty Ross, who turns 35 on Tuesday.

The English model and actress filed for divorce from her director husband Rupert Sanders in January 2013, several months after he admitted to an affair with actress Kristen Stewart.

Iovine, a talent mentor during several seasons of ‘American Idol,’ is chairman of Interscope-Geffen-A&M. His net worth of reported to be $700 million.

The ‘Keeping Up with the Kardashians’ reality star, who recently debuted blonde hair, hit Twitter to share a photo that she captioned, “Oh no big deal.”

In fact, it apparently wasn’t for Oprah — who opted to share a candid pose with Kanye and Diddy instead. She tweeted, “Party Ovah Here! @jimmywin81 iovine’s. Late night with the Fellas!”

Winfrey was also smitten with another party guest — Mick Jagger. She gushed on Twitter, “My first time meeting Mick Jagger! And yes he dances like MICK JAGGER.”

We found it hard to believe that the two famous peeps had never crossed paths prior to Saturday night — but if the former talk show maven said it, then it must be true.

Photos: Twitter-Oprah, Twitter-Kim Kardashian