updated 03/15/2012 AT 2:00 PM ET
•originally published 03/16/2012 AT 10:10 AM ET
Rihanna’s sexy see-through tops may be what’s making headlines, but she’s focused on an area a bit further south.
“I’m working on getting [my butt] back,” she tells PEOPLE. “It used to be my favorite body part, but now it’s disappeared!”
Luckily, the singer’s got plenty of techniques in mind for the task.
“I’m going to have to start hiking or at least going on the elliptical or walking on an incremental treadmill or horseback riding,” she says. “Something that firms the butt.”