Rihanna wants to get her "disappearing butt" back.

The "Rude Boy" hitmaker explained while her rear used to be her "favorite" 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.

"I'm working on getting my butt back. It used to be my favorite body part, but now it's disappeared! I'm eating everything. I've been eating ice cream and fast food and Italian food," she said.

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

"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," she added.

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