New mother Rachel McAdams has posed with breast pumps in a stunning photoshoot for US magazine Girls Girls Girls.

The Mean Girls star was photographed using the pumps in between takes of the fashion spread, with a photo of the candid moment making it into the magazine's latest issue.

In an Instagram post Girls Girls Girls founder Claire Rothstein explained the shoot had taken place just six months after McAdams gave birth.

Because Adams was still breastfeeding and expressing milk the star needed to pump in between shots.

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According to Rothstein, it was McAdams' idea to take a photo of her with the breast pumps, something which "makes me love her even more".

"Breastfeeding is the most normal thing in the world, like breathing and I can't for the life of me imagine why or how it is ever frowned upon or scared of," Rothstein wrote.

"I don't even think it needs explaining but just wanted to put this out there, as if it even changes one person's perception of something so natural, so normal, so amazing then that's great.

Rachel McAdams (left) played Regina George in iconic film Mean Girls (2004). Photo / Getty Images
Rachel McAdams (left) played Regina George in iconic film Mean Girls (2004). Photo / Getty Images

"Besides she's wearing Versace and Bulgari diamonds and is just f**king major."

McAdams' candid shot was widely praised on social media, with fans unable to resist referencing her famous Mean Girls character.

"I saw Regina George wearing Versace and a breast pump, so I'm wearing Versace and a breast pump," one person wrote on Facebook.

"On Wednesdays, we wear breast pumps," another commented.

In April, McAdams and boyfriend Jamie Linden welcomed a son but are yet to release his name.

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