Vanessa Hudgens, star of Disney's High School Musical films, is being sued by a lawyer who claims she owes him money.
Brian Schall claims Ms Hudgens agreed to pay him five per cent of her earnings in exchange for his legal services since October 2005.
Vanessa Hudgens plays student Gabriella Montez in the film
He claims the 19-year-old has since earned over $5m, and owes him a balance of $150,000 in legal fees, according to papers filed in Los Angeles.
High School Musical was a surprise hit for the US Disney Channel last year.
It began life as a low-budget movie, one of 10 such films the network produces every year.
The soundtrack became 2006's biggest-selling album in the US and led to a series of stage shows.
High School Musical 2 made its US TV debut earlier this month, and screens in the UK on Friday.
The films have made a star of Ms Hudgens, who plays shy student Gabriella Montez.
A message left with her representative about the lawsuit was not immediately returned, the Associated Press news agency said.