Kate Beckinsale flaunts incredible figure in sexy bathroom selfie -- see the pic!

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Kate Beckinsale has clearly been working on her fitness!

The 43-year-old actress shared an amazing selfie on Wednesday of her ridiculously toned body, taken during her recent photo shoot forShape magazine's February cover. Beckinsale sports a black crop top and a pair of white bikini bottoms, flaunting her killer physique.

"Laughing in bathrooms with friends," she Instagrammed.

WATCH: EXCLUSIVE -- Kate Beckinsale Reveals the Secret to Co-Parenting With Ex Michael Sheen

See Kate Beckinsale's hot pic -- and more celeb winter bods -- below:

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Wades on the water... โ›ต๐Ÿ›ณ๐Ÿ›ฅ๐Ÿน๐Ÿน๐Ÿน
๐ŸŒบ
Launching into 2017... ๐Ÿ’™๐Ÿš€ #HappyNewYear
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Neon in Costa Rica, on my app.
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Tree branch view...
Water๐Ÿ’ฆColors. #Retreat.
Laughing in bathrooms with friends
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chaos
Happy 2017 from us ๐Ÿ’š
where i belong๐Ÿ’™
Loving you so far 2017. โœŒ๐Ÿป
Stripe vibes ๐Ÿ’‹
Gone to the beach ... ๐Ÿšโ˜€๏ธ๐ŸŒˆ
Apres swim.
Soakin In the sun...#heaven #mexico
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Enjoying my last few days of 2016 in Paradise. Yes yes I know, I'm back in Hawaii & I should just move here already. ๐Ÿ“ธ by the bday girl @allymaki
Needed a vacay so badly
je t'aime mon'amie
Good morning!!๐Ÿข๐ŸŸ
First day of vacay and this is how I feel! ๐Ÿ™Œ๐Ÿผ #happyholidays๐ŸŽ„
Paraiso๐ŸŒŠ๐ŸŒŠ๐ŸŸ๐Ÿข
๐ŸŒž๐ŸŒž๐ŸŒž
Xx
On a island wit a pretty lil hitta on her bday ๐ŸŒŠ @nickiminaj ๐ŸŽ‚๐Ÿ˜
Birthday Vibes ๐ŸŒด
Happening... Malibu! Photo shoot! Summer weather! Cali life...
Beach Hut ๐ŸŒบ๐ŸŒด #paradise
On a beach coming soon๐ŸŽ„๐Ÿจ๐ŸŒž
Time for โค๏ธ๏ธ
Lord, I thank you for another year of life. #TurksAndCaicos Birthday vibes. Thanks for the ๐Ÿ’Ÿu guys. Right back atcha๐Ÿ˜›
HH brought me back a Lips๐Ÿ’‹Bikini. ๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹๐Ÿ’‹ Yes my hair is different in this shot. And Yes I'm 53. And yes I fucking own it. ๐Ÿ˜œ
๐Ÿ‘‹๐Ÿผ๐Ÿ‘‹๐Ÿผ Hello world I'm on a secluded island and my phone just broke!!! what a perfect way to celebrate thanksgiving โ˜บ๏ธ don't call or text me.. just be with the people you're with! (Unless ur my dad, then call Jack for emergencies lol) Happy turkey day!!!๐Ÿฆƒ Spread lots of love to everyone you see today.
New vlog from my week in LA LA Land is up! Link in bio ๐Ÿ™Œ
it's too cold in NYC, I want to be back here ๐ŸŒบ @brooklynhawaii @jasminemullins_mua
Almost 30 and thirsty @hotelwailea
Don't be afraid to start over. It's a chance to rebuild your life & live the way YOU want. ๐Ÿ“ธby @therichardmarx #cabo ๐Ÿ‡ฒ๐Ÿ‡ฝ#50birthday #celebration ๐Ÿ™Œ๐Ÿผ
Caught this today spear fishing!!! ๐ŸŸ๐Ÿ the only reason I don't feel terrible is because I'm eating it for lunch ๐ŸŒฎ๐ŸŒฎ
I'm tired.
Meu bebรช
Caboooo it's lit๐Ÿ˜‰๐Ÿ˜ˆ๐Ÿ™†๐Ÿป
Views.
This is living
Having a terrible time
Just us girls ... having fun โ˜€๏ธ๐Ÿ’ฆ๐Ÿ’• #foreveronvacation #Dubai #alebyalessandraswim
#samesamenotdifferent made it to the Caribbean. Get your tee now!
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Flashback - harbour island -thank goodness it's Friday. @superelixir ! Run into @nordstrom to get some @ellemacphersonbody lingerie.
Not tossed by the waves or drawn by the breeze. Master Dogen. #free
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Shanina sells seashells ๐Ÿš๐Ÿš by the seashore ๐ŸŒŠ๐Ÿ”† Bikini @shemademe
Thankful for the fans who came to my concerts in Honolulu last week๐Ÿ’–๐Ÿ’– Getting some extra island time at @grandwailea before going back to work!
Holiday Summer #sydney #australia
Time to fly thru Paradise. โ˜€๏ธ๐ŸŒด๐Ÿ‘ธ๐Ÿผโœˆ๏ธ๐ŸŒŠ๐ŸŒด
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In the accompanying interview, the Underworld star shared her secrets to her slim figure, including avoiding alcohol. "I don't drink alcohol," she revealed. "I feel [its effects] very quickly, so I've never actually had an entire glass of anything alcoholic."

She also, of course, gets plenty of exercise. Beckinsale works out with celeb trainer Gunnar Peterson five or six times a week.

"I start out absolutely dreading it, do an incredibly punishing workout, b*tch about it the whole time and end up feeling 100 percent better when I leave," she admitted. "Working out is basically nature's antidepressant."

NEWS: Kate Beckinsale Says She Was Ordered to Work Out If She Wanted a Part on 'Pearl Harbor,' Says Michael Bay Didn't Find Her 'So Attractive'

ET spoke with the British actress in December, when she shared the secret to co-parenting her 17-year-old daughter, Lily, with her ex, Michael Sheen. Watch below:


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