He was running around town with his young mistress -- while his pregnant wife spent a week in the hospital -- until football star-turned-chat-show-host Tiki Barber got tackled, the New York Post reported Tuesday.

The ex-Giants star was slapped with divorce papers following his public gallivanting with 23-year-old former NBC intern Traci Lynn Johnson.

"He couldn't be more heartless," said a friend of the gridiron great and his eight-months-pregnant wife, Ginny, whose Manhattan divorce suit cites Tiki Barber's "adultery."

"(Ginny) is very heavily pregnant and was last week ordered into the hospital on bed rest," the friend said. "Meanwhile, Tiki has been spotted all over town with his new girlfriend while she was in the hospital."

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Tiki Barber, who already has two sons with his wife of eleven years, is now shacked up with the sultry Johnson in a central Manhattan love nest.

Ginny Barber is also outraged that her estranged husband has been low-balling her in out-of-court negotiations over financial support, a family friend said.

"Tiki refused to give her anything close to what she needs," the friend said. "The reason she filed is that settlement talks didn't work."

The divorce action was filed in Manhattan Supreme Court and accepted by Tiki Barber's matrimonial lawyer on his behalf.

Meanwhile, a source said that the "Today" show has booted Tiki Barber as a high-priced correspondent amid fallout from the scandal.