Rihanna put in the “work” before Met Gala 2023 Monday.

The “Diamonds” singer, who is pregnant with her second child with A$AP Rocky, shared photos of herself posing in vintage Chanel ahead of one of fashion’s biggest nights.

“not even monday,” she captioned the carousel.

The theme for this year’s Met Gala is “Karl Lagerfeld: A Line of Beauty,” so the Fenty Beauty founder got a jump start on honoring the late designer, who also created for Balmain, Patou, Chloé and Fendi in addition to his own namesake label.

In the photos, 35-year-old RiRi modeled a white furry micro dress that outlined her growing baby bump, and paired it perfectly with a bolero jacket from the luxury brand’s archive.

The statement ensemble was part of Chanel’s Fall 1994 ready-to-wear collection, created from a black textured fabric with white contrast detailing.

Coincidentally, Nicola Peltz wore the same jacket last month while out on the town with her friends and husband Brooklyn Beckham.

For more Page Six Style you love …

The invitation-only soiree, which traditionally takes place on the first Monday in May, takes place at the Metropolitan Museum of Art in New York City and raises money for its Costume Institute.

La La Anthony, Derek Blasberg, Chloe Fineman and Emma Chamberlain are co-hosting the broadcast that will air on Vogue’s website.

Although the guest list is usually top secret, The Post also confirmed Lagerfeld’s beloved cat, Choupette, got her paws on an invite.

“It’s an event in honor of the legacy of Karl, and Choupette is obviously a central part of the legacy,” the feline’s agent told us.

Kim Kardashian and one of her siblings — likely Kendall Jenner — will also be attending.

Met Gala staple Blake Lively confirmed she won’t be attending this year’s soiree, and it’s been announced that Jonathan Majors also will be missing the event following accusations of domestic violence.