According to Daily Star, pop star likes to spend two to four hours in sauna at the Mandara Spa at Planet Hollywood in Las Vegas. She likes to sweat!

A source close to Britney said: “She managed to lose five pounds and credits her new love of saunas. She thinks it’s a great way to shed weight without really trying.

“She’s loves soaking up the heat and relaxing so much she often has two two-hour sessions in a single day.”