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THIS is her secret?! We wish we'd known this earlier!

Britney Spears has some of the best abs in the biz, and apparently, her trick to keep her stomach flat is eating McDonald's cheeseburgers! Well, not exactly, but let her explain...

"I have the small burgers from McDonald’s. The happy meal! Sometimes I’m just like, 'I want a hamburger!' but when I’m in work mode, I want [to eat] very clean. I want clean chicken and veggies that’s it. My stomach is so sensitive, if I have a steak, I will be sick for three days," she revealed to ET about her tour diet.

Another way Brit Brit burns calories? Swimming with her man!

The pop princess shared the below Instagram of herself and beau Sam Asghari taking a dip in the pool, and it's like they're having a hot body contest!