American Idol winner Fantasia Barrino is dating a married father of two who left his wife and young children to move in with her, Star has learned.

Fantasia, 25, first met 30-year-old Antwaun Cook, a hunky former college football player from Charlotte, N.C., while he was working at his T-Mobile store in August — and the attraction was instant.

By mid-September, the insider says, Antwaun, who also works as a real estate agent, dumped his teacher wife and their sons, ages 4 and 1, and moved into Fantasia's $1.3 million mansion in Charlotte's ritzy suburb of Piper Glen.

“I’m not going to deny that the word ‘home wrecker’ is floating around,” a friend of the singer tells Star.

And adding fuel to the fire: Fantasia has tattooed Antwaun's last name on her left shoulder to match one he has, says the friend. “She got it to honor her man!"