Ariana Grande Channels Marilyn Monroe With Sultry 'Diamonds Are a Girl's Best Friend' Cover

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Ariana Grande is slaying us with her Old Hollywood vibes!

The 23-year-old pop star channeled Marilyn Monroe for a performance of "Diamonds Are a Girl's Best Friend," appropriately delivered at the grand re-opening of Tiffany & Co. in Beverly Hills on Thursday night. Luckily for us peasants at home, Queen Ariana shared the delicious moment on Instagram.

WATCH: Kate Hudson Frosts Herself With Diamonds at Tiffany Event With Jennifer Garner and Reese Witherspoon 

Grande is in the midst of gearing up for her Dangerous Woman tour, kicking off on Feb. 2 in Phoenix, Arizona. The show will wind its way through North America, wrapping on April 15 in Orlando, Florida, Grande's home state.

But first, she'll appear as Penny in NBC's Dec. 7 telecast of Hairspray Live!

"It's a lot, but I'm very grateful to be doing what I love and also getting to do these special things," she recently told ET. "Doing Hairspray is my sole dream come true. Like, I'm so fulfilled. I'm so excited."

"I think it's a really strong message that we need right now," she added. "It's such a crazy time to be doing that show. ... With everything that's going on in the world -- the intolerance, the ignorance, the hate and ridiculousness -- it's just so crazy how this takes place in the '60s and, like, we're still working on all that. It's playful, but also very necessary."

WATCH: Ariana Grande Reveals Her Ideal Date Night -- and It Involves Pokemon