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Golden Globe winner Don Cheadle kept simple in a black tee, grey hat, nighttime sunglasses.
Nick Cannon sported a motorcycle jacket, round glasses, and matching turban to the fight.
The Newsroom lead teamed up with Jamie Foxx for a punchy pink carpet portrait.
Jennifer Lopez and Alex Rodriguez were some of the biggest names sitting ringside.
Muscles were not the only thing bulging during the spectacular stare-down, with veins visibly popping in Mc Gregor's neck as he screamed in the face of his more composed opponent.
The All I Have artist added a simple buy glam touch with hoop earrings and a polished half-ponytail. The Oscar winner kept under the radar with a dark Detroit cap and sunglasses.
An audience packed with 20,000 ravenous fans is expected at the T-Mobile Arena in Las Vegas, USA, with private jets ferrying celebrities into Vegas as bets worth more than a million dollars are placed on the bout.
Mayweather, who has an incredible undefeated record of 49-0 to his name, has come out of retirement to fight the younger Mc Gregor.
The actress, 28, packed a punch on the hot pink carpet in a slinky white dress that flashed a little cleavage. The ex of Aaron Rodgers was all smiles while showing off her long, tan stems in the flirty frock.
She was joined on the red carpet by her boyfriend, Austin Butler, who sharpened up in a black suit. She glammed up the look with tousled curls, firey, red lips and a matching manicure.