Rihanna has filed a countersuit against former personal trainer Cindy Percival.

The 'Rude Boy' singer - who is being sued by Cindy for $26,144.14 worth of unpaid wages from 2009 - has now hit back in another court case, claiming the exercise expert took $26,244.63 from her.

I work out every day but I need a trainer to motivate me - I don't find it much fun working out on my own.

In her claims, Rihanna suggests she gave more than $24,000 upfront to Cindy for services in the future, but never had the money returned when she fired the trainer.

Cindy previously claimed she was hired by the 22-year-old star to perform "exclusive personal training services" for $1,500 a day, but wasn't paid for a number of weeks in September and October.

Rihanna has previously discussed her exercise regime, confessing the need for a trainer to keep her motivated.

She said: "I stay in shape with a lot of hard work and a lot of running on the treadmill. Cardio is the key.

"I have a personal trainer who travels with me if we have a big event coming up.

"I work out every day but I need a trainer to motivate me - I don't find it much fun working out on my own."