Britney Spears has to work hard to "keep her butt up".
The singer poses for the June edition of Shape magazine, looking svelte and toned in a white bikini.
The 31-year-old admitted that as she has grown older, her butt is the part of her body she has to work particularly hard to maintain.
“I like it, then again, I hate it," Britney laughed to the magazine. "I’m in my 30s now, so I have to work harder to keep it ‘up’.”
The star appears on the cover of the fitness magazine where she highlights her flat stomach with a belly button piercing.
The mother-of-two credits yoga and Nutrisystem weight loss programs for helping her maintain her healthy figure over her years in the spotlight.
Britney finds it hard to stick to a diet, namely because the best dishes she cooks tend not to be the most healthy.
“Dieting is tough… because my specialties are spaghetti, brownies and chocolate chip cookies," she revealed.
The pop songstress has teamed up with Black Eyed Peas star will.i.am for her new album.
The musician confirmed he will serve as executive producer on Britney's forthcoming record during an interview with Rolling Stone.
The pair have already worked together on song Scream & Shout, but their new collaboration will show Britney's softer side.
"I was like, 'OK, look, guys, me and Britney need to have lunch four times a month for three months before I even try to go in the studio with her.' Because we need to talk," he told Rolling Stone.
"We need to talk about what she's excited about in life. I gotta talk about the things that hurt her. I gotta talk about the things that make her concerned — she's a mother. I gotta talk to her about all the things that her fans want to talk to her about. I gotta be the vehicle between her and her fans. We can't do another song about going on the dance floor. Really? Didn't we see a bunch of Britney doing that already? Don't we want to see something that comes from her heart?"