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Posted Tue, July 6, 2010 11:14am EDT

Kristen Stewart Contain Yourself! Rob Is Making Out With Reese Witherspoon!

The camera doesn’t lie: R-Patz is now locking lips with another leading lady!

Look away, Kristen Stewart: We’ve just stumbled upon photos of Robert Pattinson kissing his co-star Reese Witherspoon on the set of their new film Water For Elephants! We wonder how his Twilight co-star Kristen Stewart feels about her BF playing kissy face with the gorgeous and more mature blonde.

The 24-year-old Brit appears to be all smiles while hanging with Reese, 34. The two actually starred together in the 2004 film Vanity Fair – he played her son! Wow, we bet he never imagined he’d be making out with his onscreen mom just 12 years later!

-Chloe Melas