Bradley Cooper, Renee Zellweger split after nearly two years together

After nearly two years of dating,Bradley CooperandRenee Zellwegerhave called it quits.

The low-key couple, who never officially confirmed their romance, first met on the 2006 set of their thriller flop,"Case 39,"but didn't begin dating until 2009.

Throughout the course of their under-the-radar romance, Bradley and Zellweger were frequently spotted by each others' side during jaunts toNew York,Los Angeles,Utah,SpainandVancouver.

Their relationship seemed to turn serious during the 2009 holiday season when Zellweger opted to spend the holidays inPhiladelphiawith Cooper's family. Since then, she has often been seen hanging out with the actor's mother in Los Angeles.

Last year, Zellweger even moved into Cooper's $4.7 million, 3-bedroom, 3-bath house inPacific Palisades,Calif.

"I can't say enough about her,"Cooper, 36, gushed about Zellweger to"Entertainment Tonight"last fall."I just love her. I {loved} coming to work. I love acting with her. I can learn so much from her."

Echoing his sentiments, Zellweger, 41, also told"ET,""{Bradley}'s a great, great actor. I just got so excited, not believing that I was going to go to work with him."

The two have since remained tight-lipped about their relationship, which some speculated began to have trouble in February when each attended a pre-Oscar party separately and didn't hang out with together.

Reps for both Cooper and Zellweger have no comment.

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