Britney Spears allegedly allowed a stranger to snort cocaine off her chest during a wild night of partying.

The troubled star invited guitarist Scott Kohler and ten other revelers back to her Hollywood mansion for a party, just two days after she lost visiting rights to her two young sons.

Scott, who had met Britney earlier that night in Los Angeles club Hyde, claims one male member of the party offered Britney cocaine and "joked he wanted to do a line off her chest and she agreed."

Scott, 29, said Britney "seemed drunk" and alleged she also snorted the class-A drug, even though she passed a court ordered drug test the next day.

He added to In Touch Weekly magazine, "She was in a great mood. She didn't have a care in the world."

Britney - who lost joint custody of Sean Preston, two, and 13-month-old Jayden James to ex-husband Kevin Federline last month - had her visitation rights taken away by a judge after she couldn't be contacted by court officials who needed to arrange her next court-ordered drugs test.

However, she has since had her rights reinstated and is allowed to see the boys, through monitored visits, three times a week.

Earlier this week, a judge turned down Britney's plea for joint custody after a parenting coach said she "rarely" talked or played with the children.

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