Zoe Saldana is the September cover girl for Women's Health U.K.

For the nude issue, Saldana stripped down and looked fresh faced. In one of the inside images, Saldana bares her bottom completely, as well as the star tattoo she has on her side.

Saldana shared the cover image on her Instagram account.

"My September issue of @womenshealthuk @womenshealthmag is out! #Naked as a baby's butt! Hope you like it! #guardiansofthegalaxy," she said. 

The "Guardians of the Galaxy" actress recently turned 36, and she talked about how her body was changing.

"My body is less toned," she said. "I do look in the mirror and see things I don't want. My first reaction is I breathe and I think, 'I'm a woman. I'm 36. My body is changing.'"

But she said that she feels more beautiful now than when she was working out much more. She said that sometimes she thought she looked "too muscular and flat chested," before admitting that it's difficult to be completely happy with what one has.

She added that her body has told her to slow down, but it's not easy for her.

"And I struggle with that," she said. "I love to be an athlete."

Saldana didn't mention anything about being pregnant in the magazine, but she did talk about making changes to her life.

"I've learnt to listen to myself, so whenever I don't feel like doing anything that starts with 'I should' then I don't," she said.

She also spoke about her relationship with Marco Perego.

Saldana knew him for years before the two decided to get married last year.

"We give each other a great deal of support and love, but it wasn't because we found it in each other," she said. "We came that way and then got together. That's what I love about it. I do believe whatever's meant to be will be-but had the universe said, 'let's just wait. He's going to come into your life later,' I would've been fine on this journey I was on just knowing who the f*ck I was."