Rihanna is facing a lawsuit over her toned physique - the singer's former personal trainer alleges she is owed $26,000 in unpaid wages. Fitness expert Cindy Percival filed a suit in Los Angeles County Superior Court last week, which states the Umbrella hit-maker owes her payment for several weeks of intense training.

In the court papers, Percival claims she charged the star $1,500-a-day for her services, and is still owed a total of $26,144 for her work with Rihanna last year.

The amount also includes $2,644 for travel expenses, which the trainer claims she spent while following the superstar around the world, according to TMZ.com.

Click Here For More Rihanna Pictures