The 41-year-old actor -- who's dated Renee Zellweger and Suki Waterhouse in the past -- has been careful in prior relationships not to show any signs of PDA -- but that's not the case with supermodel Irina Shayk.
The happy couple showed up to the L'Oreal Red Obsession Party as part of Paris Fashion Week on Tuesday, and were caught in a passionate kiss. Then again, the 30-year-old model did look irresistible in her red, cleavage-baring gown.
Going even more public with their relationship, Cooper and Shayk also posed for photos at the party, and were snapped standing alongside Nicole Scherzinger's ex-fiance, Lewis Hamilton.
Over the past few days, Cooper has been supporting his girlfriend at Paris Fashion Week. On Sunday, he was seen front row at the Givenchy fashion show, watching intently as Shayk walked the runway.