Rosie Huntington-Whiteley in Bathing Suit Shares a Mirror Selfie

Rosie Huntington-Whiteley is in vacation mode in her swimsuit! The supermodel mother-of-two flaunts her famously fit figure via her latest Instagram Stories. The catwalk stunner is currently vacationing in the tropics with her family, modeling a variety of swimsuits during their stay. In one mirror selfie she wears a black bathing suit, and in another, a red one. How does she stay so fit? Read on to see 7 of Rosie Hungtington-Whitely's top diet and fitness tips for staying in shape 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!

Rosie makes exercise a priority. "I make it a priority to get to the gym around three times a week. Exercise is a huge stress relief for me, and I always feel good when I leave a workout. Getting there, however, is another story!" she told Poosh.

Rosie swears by sleep. "It's rare I get a morning where I get to relax in bed with no disruptions, so sleeping in is definitely considered a splurge for me. I also love a good massage every Monday night with Anastasia from Anastasia Mobile Spa," she told Pooch. Some common types of massage include:

1. Swedish massage: This is a relaxation massage that involves long, flowing strokes to promote relaxation and improve circulation.
2. Deep tissue massage: This type of massage targets the deeper layers of muscle and connective tissue to release tension and knots. It can be more intense than Swedish massage.
3. Hot stone massage: This type of massage involves the use of heated stones placed on the body to promote relaxation and improve circulation.

Rosie is one of the many stars who does intermittent fasting. She tries not to eat after 6pm and only eats during an eight to 10-hour window. She starts the day with a matcha latte with oat milk. "It gives my body a chance to digest everything," she told The Sunday Times Style.

Rosie is constantly on the go. "Whenever my day allows it, I'll be at the gym by 9am. I'm always active – my mum was an aerobics instructor when I was young and she was always encouraging my siblings and me to be sporty. So despite the fact I have to keep fit for my career, I'm one of those people who genuinely loves exercise – what I do just depends on my mood or schedule," she told Women's Health.

Rosie rotates between a variety of workouts. "If I'm jet lagged or just fancy doing something gentler, I'll do a yoga or Pilates session with instructor Andie Hecker at Ballet Bodies in LA. She's a former ballerina so she knows how I want my body to look – long, lean and toned," she told Women's Healthy. "When I want something upbeat, I'll head to Tracy Anderson's studio and Simone De La Rue at Body By Simone. I love their mix of aerobics and dance – their classes are really intense and challenging. When I'm in London, I work out with my brother Toby at Workshop Gymnasium, or he'll come to my hotel and squeeze in a circuits sessions between my work schedules."

Rosie also makes sure to stay hydrated "Every morning, I'll get up and chug back a litre of water. I aim for at least three litres a day; since getting strict about it I've seen a massive difference to my digestion and my skin," she told Women's Health. How much water do you need? According to the U.S. National Academies of Sciences, Engineering, and Medicine men should drink about 15.5 cups (3.7 liters) of fluids a day and women about 11.5 cups (2.7 liters) of fluids.

It all sounds quite virtuous, but my strategy is to eat clean and simply at home so I can enjoy myself when I'm out," she told Women's Health. "That doesn't mean I don't stay mindful about what I'm eating – I'm certainly not going to chow down on a massive bowl of pasta the night before a lingerie shoot – but I never want to be the girl looking miserable pushing a salad around my plate or nibbling on a celery stalk. Life's too short and food is too good: French fries, cheese, bread, bacon…."