Actress Lindsay Lohan made a surprise appearance at an AIDS benefit gala on Wednesday in New York.

The Mean Girls star, who has been in and out of rehab and jail since 2007, was wearing a Roberto Cavalli dress for the star-studded black-tie amfAR event.

She will stand trial on March 18 on charges she lied to California police about a June car crash and violated probation, raising the possibility she could be sent back to jail.

A judge in Los Angeles on Jan. 30 set the trial date on charges related to the car crash and said the court will hold a hearing at the same time on whether Lohan in the incident violated probation from a 2011 jewelry theft.

The 26 year old was also arrested in New York on a  misdemeanor assault charge in November. The Manhattan      district attorney’s office has not filed a criminal complaint in the assault case.