Floyd Mayweather Celebrates Birthday With Jamie Foxx, Two Days Before Fight

Floyd Mayweather is fighting this weekend, but the boxing legend didn't seem too fazed about the bout on Thursday ... partying it up with Jamie Foxx to celebrate his birthday!!

TBE welcomed all his friends to Restaurant Ours in London to honor his 46th trip around the sun ... and the bash had a ton of booze, an incredible cake -- and of course, huge tributes to the man of the hour.

Foxx looked like the life of the party ... showing off his dance moves while sporting a fancy purple suit.

Mayweather was spotted wearing a Clueless-esque yellow plaid outfit ... posing with a massive bottle of bubbly -- but remember, the guy doesn't drink, so we're assuming it was just for a photo op.

Actor Evan Ross, celeb jeweler Johnny Dang and designer Ozwald Boateng were in attendance ... as well as a ton of beautiful women, including model Ivana Knoll, who documented the rager on her social media page.

The event went down just 48 hours before Floyd is set to enter the ring with reality TV star and former Bellator fighter Aaron Chalmers at the O2 Arena in London on Saturday ... and it sure seems like he's feeling good before the exhibition bout.