A judge has ordered Bianca Jagger, former wife of Rolling Stone Mick Jagger, to pay a $500 fine for failing to pay rent on a Park Avenue apartment that she says is infested with toxic mold and unlivable and has made her sick.

State Supreme Court Justice Leland DeGrasse imposed the fine after citing Jagger for contempt of court. He said she was "willfully disobeying the explicit directives of two prior court orders requiring Jagger to pay rent" while her case was pending.

Jagger has sued her landlord, Katz Park Ave. Corp., for $20 million, saying water leaks and toxic mold made her 18th floor apartment uninhabitable. She has failed to pay the monthly rent of $4614.29 since February, the judge found.

DeGrasse ordered Jagger to continue to pay the rent to the court on the first day of each month until her case is resolved. The judge said that if she fails to pay rent, then Katz may serve a notice of default, and five days after that notice is filed, Katz may apply to have her evicted.

Jagger's lawyer, Ryan S. Goldstein, was out of his office Wednesday and not immediately available for comment.

Katz's lawyer, James Davies, declined to comment on the ruling.