Rihanna wants to get her "disappearing butt" back.

The 'Rude Boy' hitmaker explained while her rear used to be her "favourite" part of her body, she is having to work hard on getting it back and is "eating everything" in the hope of restoring her bottom to its former voluptuous glory.

She said: "I'm working on getting my butt back. It used to be my favourite body part, but now it's disappeared!

"I'm eating everything. I've been eating ice cream and fast food and Italian food."

Meanwhile, the singer is planning on undertaking a whole host of activities that "firm the butt".

She added to People.com: "I'm going to have to start hiking or at least going on the elliptical or walking on an incremental treadmill or horseback riding. Something that firms the butt."

Rihanna's recent weight loss came after her father, Ronald Fenty, told her to shed a few pounds because she was getting "too fat".

He recently said: "I actually thought she was a little fat the last time I saw her.

"But when I saw her at this year's Grammys, I thought she was back to her normal size. I used to joke with her, 'Robyn, [Rihanna's first name], you're getting too fat.' But I think she's fine. I think she looked excellent, as everyone saw, at the Grammys. She's dieting, she's working out."