A former personal assistant of Lady Gaga is suing the U.S. pop star, claiming she's owed hundreds of thousands of dollars in back pay.

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Jennifer O'Neill, 41, of Long Island, N.Y., alleges she was required to be available to Gaga at all hours of the day and night during the singer's 2010 Monster Ball world tour, court papers show. Gaga was so demanding, she says in her lawsuit, she had no time to eat and at times even sleep, the newspaper reported exclusively Sunday.

O'Neill was paid $75,000 a year but in her lawsuit filed against Gaga's Mermaid Touring Co. last week in U.S. District Court in New York, she seeks $380,000 for 7,168 hours of overtime for which she says she was never paid. She also seeks other, unspecified damages.

O'Neill did not respond to requests for comment, the Post said.

A spokeswoman for Gaga, real name Stefani Germanotta, called the lawsuit "completely without merit."

The newspaper also reported a book, "Poker Face: The Rise and Rise of Lady Gaga," tells of another former personal assistant, Angela Ciemny, who was required to frequently sleep with Gaga, as well as do makeup together and sometimes even shower at the same time.