Brittney Griner clearly isn't taking her newfound freedom for granted ... she hit up the Met Gala with her wife on Monday night -- and didn't seem to stop smiling once.
The 32-year-old -- who was freed from Russian custody just five months ago -- wore a custom Calvin Klein suit for the occasion ... and couldn't have been happier to be with her spouse at the ultra-exclusive party.
She and Cherelle Griner flashed ear-to-ear grins for the entirety of their walk into the event .