Kristen Stewart Sparkles in Ab-Baring Bra Top at Spencer Premiere 

Surprise! Kristen Stewart has some of the most chiseled abs in Hollywood. The 31-year-old flashed her incredibly toned midsection at the Los Angeles premiere of Spencer on Tuesday night, rocking a head-turning two-piece look from Chanel, involving a black bra top and tiered skirt, featuring a sheer panel that fully exposed her flat tummy. How does the actress, currently promoting her upcoming role as Princess Diana in the movie Spencer maintain her mental and physical health? Read on to see 5 ways Kristen Stewart prioritizes self-care and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bathing Suit Photos!

1. She Loves to Cook

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Kristen has revealed that food sparks joy in her life. During a 2015 interview with Harper’s Bazaar, she revealed that cooking is one of her go-to hobbies. “I tend to be a little more instinctive,” she told Jimmy Kimmel about her cooking method. Carby, Italian dishes are her favorite, including pasta with bolognese, cacio e pepe, and fettuccine with langoustines.

2. She Also Loves Eating, “Terribly”

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Kristen confessed to Harper’s Bazaar that she can “eat terribly for long periods of time” and doesn’t feel bad about it. “I can have meals at gas stations.” During these periods, she doesn’t care about weight gain. “I'm a little bigger than sample size when I'm eating cheeseburgers and am happy and comfortable.”

3. Her “Weight Falls Off” When She Is Working

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“If I'm stressed or working, the weight falls off,” she told Harper’s Bazaar. “My weight and my sleep are tied to my nervous system. Sometimes I'll sleep for 12 hours a night and sometimes sleep just doesn't exist for me for a couple of months. I'm a small person, but if I'm wrecked I get too thin. But then if I'm really happy... I enjoy food immensely and I like a glass of red wine.”

4. She Works Out

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Kristen works out hard when she needs to get into “phenomenal” shape, which usually involves one month and a personal trainer. However, she maintains that sometime she can whip herself into shape in just two weeks doing press-ups. “If I'm not in good shape, I can do 10. If I'm trying to get fit, I'll drop and do 20 every half hour throughout the day. I can do 250 push-ups in one day, which is pretty impressive. But I'm such a one-upper. I'm always the kid that's arm-wrestling with her friends and trying to juggle four balls instead of three and saying, ‘Ooh, can you light this lighter with your pinkie? I can,’” she told Harper’s Bazaar.

5. She Used to Have Panic Attacks

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“I went through so much stress and periods of strife. I would have panic attacks…I literally always had a stomach ache. And I was a control freak and I couldn't anticipate what was going to happen in a given situation, so I'd be like, 'Maybe I'm going to get sick'... It's kind of remarkable. I just grew out of it, but that's not to say I don't get worried,” she told Elle UK about her mental health.