Met Gala 2015: Top Instagrams From the Night

Stars post snapshots getting ready for the Met Gala and later from inside.

— -- Before making their grand entrances at Monday night's Met Ball, the stars gave fans a first look at their outfits.

Under the reign of Vogue editor Anna Wintour, the Metropolitan Museum of Art’s Costume Institute benefit is truly one of the biggest parties of the year.

And one of its newest stars, Amal Clooney, was christened by Wintour, when the editor posed beside the barrister beauty for an Instagram shot of Clooney's last minute preparations before the big night.

Sarah Jessica Parker

Sarah Jessica Parker's outfit was the talk of the night. On Instagram, she posed with "standing date" Andy Cohen of Bravo's and revealed to fans that her dress was designed by her in collaboration with retailer H&M. As for the most-talked about headpiece, it was designed by Irish Hat designer Philip Treacy.

Beyonce

Beyonce posted several shots of her peekaboo gown, including the front and back.

Kerry Washington, dressed in Prada, evoked the fairy tale magic of the evening with her Instagram pic, which she captioned, "Once upon a time... #MetBall"

Zac Posen and Katie Holmes

Designer Zac Posen revealed his date, good friend Katie Holmes, with an Instagram video of the pair strolling through Central Park with a twirl and a kiss.

Earlier, Holmes posted a "before" photo of her "about to start getting ready," with the designer's team.

Emma Roberts

Emma Roberts offered a sneak peek at her makeup and accessories for the China-themed evening.

Later she posed in the limo for designer Ralph Lauren, who designed her dress for the gala.

Jessica Alba, wearing Kenzo, posted a shot of her with Opening Ceremony retailers Carol Lim and Humberto Leon before the ball.

Later, some stars provided glimpses from inside the gala.

Justin Bieber and Cara Delevingne

Justin Bieber and Cara Delevingne took a selfie.

Kerry Washington and Alicia Keys

Perhaps new moms Kerry Washington and Alicia Keys compared notes after their selfie.

Washington posted another selfie of her posing with Common, Lee Daniels and Taraji P. Henson.

New BFFs Sofia Vergara and Reese Witherspoon couldn't resist posing together. "I think she loves me as much as I love her?" Witherspoon captioned the photo.