Bet you've never seen a cover like this before!

Actress Rachel McAdams has been making waves all week after the release of her cover photo for Girls. Girls. Girls magazine. The photo depicts a glammed-up McAdams looking squarely into the camera, draped in designer diamonds and jewellery ... and absolutely rocking a breast pump.

Say what?

But photographer Claire Rothstein made no mistake when she snapped this trailblazing photo of The Notebook star as she expressed breastmilk while on the set of her photo shoot. A mom herself, Rothstein was very intentional in her decision - which McAdams fully supported - and she explained this at great length via Instagram.

"Breastfeeding is the most normal thing in the world and I can’t for the life of me imagine why or how it is ever frowned upon or scared of," she captioned the iconic photo. "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."

Naturally, the photo has gone viral, garnering over 70,000 likes and thousands of comments. Many called it a "breakthrough image", and women and mothers from all over the globe chimed in to show their appreciation. It also brought a lot of chatter on Twitter, with the hashtag #RachelMcAdams trending.

Most importantly, the timely photo comes on the heels of the ongoing campaign to normalize breastfeeding for new and working mothers. As the campaign has gained traction over the recent months, many celebrities, brands and influencers have jumped onboard to help reverse the stigma of breastfeeding in public. It has not been without controversy, however. Women are still regularly shamed for feeding their babies in public, and many still view breastfeeding as a modest act that should be done in private.

McAdams, 39, has been extremely private about her pregnancy and birth of her son (whose name she has yet to disclose) this past April, with partner Jamie Linden. The Oscar nominee recently opened up for the first time about her parenting journey since her son's birth, acknowledging that she had waited "a long time" for motherhood.

"It's the greatest thing that's ever happened to me, hands down," she said. "I had 39 years of me, I was sick of me, I was so happy to put the focus on some other person."

Although the Canadian-born actress has grown up literally in front of our eyes on the big - and small - screen, McAdams vows that she will raise her little boy out of the public eye, and especially away from social media.

"I want to keep his life private, even if mine isn't," she said.

NEXT: Rachel McAdams Has Delivered Her First Baby After Keeping Her Pregnancy A Secret