NSFW! Kate Hudson Shows Her Bare Butt While Lying Naked in a Bathtub on Instagram

Kate Hudson's body is out of this world.

Get ready to see a whole lot of Kate Hudson.

The 36-year-old actress is completely nude and lounging on her stomach in a bathtub in an Instagram photo from almost three months ago, which somehow managed to stay under the radar until now. (Hey, better late than never, right?) The picture -- which prominently shows Hudson's bare butt -- was posted by her stylist, Sophie Lopez.

#JustAnotherDayAtTheOffice," Lopez captioned the NSFW pic.

WATCH: Celebs In Their Underwear

Hudson herself commented on the post, shouting out her clothing line.

"Omg! You're so fired! #Fabletics," she joked.

Clearly, Hudson's incredible physique takes plenty of discipline and hard work.

"You got to work pretty hard," Hudson admitted to ET about maintaining her svelte bod when we caught up with her in October at the opening of her latest Fabletics store in Los Angeles.

And just how hard does she works?

She even exercises while she's in the kitchen.

"For me, I think food too is huge," she also dished to Glamour in June. " ... It's no dairy, it's no wheat, it's gluten-free, no meat, and no sugar. I just cut all of that out. And no wine and no beer -- only vodka and only tequila, straight up."

Although, these days, it's not all work and no play for Hudson. The mother-of-two is currently busy promoting Kung Fu Panda 3, but she also recently found time to interact with an adorable baby panda in China.

WATCH: Even Kate Hudson's Son Realizes How Young She Looks

ET caught up with the beautiful blonde at the Golden Globes earlier this month, when she was coy about all those dating rumors between her and Nick Jonas.

"[He's a] sweetheart, but there's nothing to talk about," Hudson smiled.

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