Is former American Idol Fantasia Barrino a hubby humper? Say it ain’t so, Fanny! Star Magazine has blown the lid off of the Grammy-nominated powerhouse’s secret romance with a married father of two! And if that isn’t scandalous enough, a snitch in Barrino’s camp claims the cell phone salesman has dumped his wife and young children and moved into the “Truth Is” singer’s $1.3 million mansion in Charlotte’s upscale Piper Glen suburb.

“I’m not going to deny that the word ‘homewrecker’ is floating around,” a friend of the singer reveals in Star’s Nov. 30 issue.

According to Star: 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.

But pals say Fantasia’s tawdry affair with Antwaun is based on more than just sex; the former teen mom has set her sights on becoming the new Mrs. Cook and even tattooed her man’s last name on her left shoulder to match one he has.

“She got it to honor her man!”