Madonna has brought her family problems to work, apparently calling her ex-husband a c**t on stage.

The Unapologetic B***h singer is currently in a bitter custody battle with former husband Guy Richie over their 15-year-old son Rocco.

Madonna was heard taking a swipe at her former husband when responding to a fan's marriage proposal during her Nashville concert on Monday..

"I'm looking for a husband, not a c**t," she said, according to The Sun.

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"I already married a c**t."

Madonna has been fighting to be reunited with her son after he left to go live with his father in December.

She appeared in court in New York before Christmas where a judge ordered Rocco to return to his mother to spend the holidays with her.

He remains in the UK with his father.

The pair were married for eight years before divorcing in 2008. Madonna has faced some bad press over the last week, where she was accused of being drunk onstage during her Louisville concert, a claim she flatly denied.

She was also two hours late for her Nashville concert, according to fans.

- AAP