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Robert Buckley, Whitney Port

SETH BROWARNIK/RED EYE PRODUCTIONS

After Robert Buckley and Whitney Port worked a party together in Miami, the two got worked up.

Whit and Rob cohosted the Shore Club in South Beach for Havaianas Hot Spring Break bash, and continued to hang out after their official duties ended.

A source tells E! News that the two were spotted making out at Nobu later that night as they had dinner with a group of friends.

While sparks were indeed flying, it sounds like things didn't go much further. "They definitely did not spend the night together," the source says. "She was there with her little sister."

Whitney reportedly just split with Jay Lyon, who stars on The City with her.

—Additional reporting by Noelia Murphy