Former “American Idol” third season grand winner Fantasia Barrino just had a baby with his current boyfriend, Antwaun Cook. However, reports say Cook is already running around with his ex-wife.

According to insiders, despite being with Fantasia Barrino, Antwaun Cook regrets giving up on his estranged wife, Paula Cook and their two kids – and while Paula is very hurt, relations between the two are starting to thaw. A source said, “Paula and Antwaun both ended up at Club RE:Public in Charlotte over the weekend and things got a little cozy between the two. I don’t know where Fantasia was, but she definitely wasn’t in the club where they were! Antwaun was shoving his tongue down [Paula's] throat.”

The source went on saying that while Paula Cook was receptive, she did not want to make a scene and was still a little shy with all the PDA. However, “he [Antwaun Cook] told Paula she belongs to him because she’s still his wife!”

Fantasia Barrino and Antwaun Cook allegedly began dating while Cook was still married to and living with Paula.

“What Fantasia Barrino doesn’t know is that through all of this, Paula hasn’t changed the locks on the house she once shared with Antwaun,” the source said. “And Antwaun Cook still has keys, so you can put two and two together,” the source continued.

“Antwaun has lost interest in Fantasia. He was even egging people on to take pictures of him and Paula together … he didn’t care who knew,” concluded the source.