Jason Derulo and his ex Jena Frumes sparked rumors of a reconciliation after they were seen cozying up on a yachtin Miami, Florida on Sunday.While spending the day on the water, the singer, 32, and 28-year-old model packed on the PDA as they shared a jet ski to cruise around the ocean.As theTalk Dirty crooner went shirtless in just a pair ofFendi swim shorts, he could be steering their watercraft as hisbikini-clad baby mama held onto his shoulders. Back on? While spending the day on the water, Jason Derulo, 32, and 28-year-old fitness model Jena Frumes packed on the PDA as they shared a jet skiFrumes wore a plunging white bikini and her waist-length hair in braids.