Selma Blair and Ashley Olsen at Dia: Beacon Spring Benefit

Courtesy of COS

Let's address the elephant in the room: the biggest part of the week was hands-down the Met Gala, where Rihanna arrived looking like a pope, and to the surprise of everyone, 2Chainz decided to propose to his ... wife. After hours, the fun continued at a string of parties hosted by Balmain, Rihanna, and Donatella Versace, the reason for this Kim Kardashian bondage moment.

VIDEO: See All of the 2018 Met Gala Arrivals

Red carpets aside, celebrities continued making appearances at smaller, more intimate gatherings. Selma Blair caught up with one half of The Row, Ashley Olsen, at the COS-hosted Dia: Beacon Spring Benefit, where they each celebrated the Dia Art Foundation's new installations by Mary Corse and Dorothea Rockburne. Olsen, if you didn't know, is a big art nerd.

Later, Blake Lively hosted Baby2Baby's fifth annual Mother's Day celebration in a pretty pink dress, while Selena Gomez, Sarah Paulson, Claire Danes, and Tracee Ellis Ross all sat front row at Prada's resort 2019 fashion show.

Below, the best parties of the week.

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Rihanna

Kevin Mazur/Getty Images

at the launch of her Savage X Fenty lingerie collection.

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Blake Lively

Michael Simon/Star Tracks

at Baby2Baby's fifth annual Mother’s Day celebration with Shutterfly at The Wing Dumbo.

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Nina Agdal and Christie Brinkley

Jamie McCarthy/Getty Images

at the Moët & Chandon-hosted after-party for the premiere of Always at The Carlyle.

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Lena Hall

Jim Spellman/WireImage

at the Moët & Chandon-hosted after-party for the premiere of Always at The Carlyle.

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Selena Gomez

Jared Siskin/Getty Images

at Prada's resort 2019 fashion show.

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Sarah Paulson, Claire Danes, and Tracee Ellis Ross

Jared Siskin/Getty Images

at Prada's resort 2019 fashion show.

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Rowan Blanchard

Neil Rasmus/BFA.com

at the launch of the Disney x Coach: A Dark Fairy Tale collection.

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Brandon Maxwell, Jourdan Dunn, and Ryan Korban

Joe Schildhorn /BFA.com

at a cocktail party celebrating Korban's newest development, 40 Bleecker.

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Carey Mulligan, Paul Dano, and Zoe Kazan

David M. Benett/Getty Images

at the Wildlife party at Nikki Beach in Cannes, hosted by Grey Goose and DirecTV.

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Stella McCartney

Ilya S. Savenok/Getty Images

at the David Lynch Foundation’s Women Of Vision benefit luncheon.

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Norma Kamali and Fern Mallis

Ilya S. Savenok/Getty Images

at the David Lynch Foundation’s Women Of Vision benefit luncheon.

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St. Vincent

Courtesy of WeWork

at the WeWork San Francisco Creator Awards.

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Star-Studded: The Best Parties This Week