Although he recently announced plans to retire from official duties in the autumn, he spent Tuesday at Royal Ascot with the Queen.
Some of those A-listers who took their seats ringside were Bruce Willis, Leonardo Di Caprio, Jennifer Lopez, Vanessa Hudgens, Demi Lovato and Le Bron James, all spotted eagerly waiting for the big fight.
The money-spinning showdown is likely to break all records and surpass the $600million generated by Mayweather's fight with Manny Pacquiao in 2015.
Floyd Mayweather has defeated Conor Mc Gregor after the two men squared off in what was billed as the Fight of the Century in the highly anticipated and Hollywood studded match in a Las Vegas arena on Saturday night.
Mayweather outlasted Mc Gregor, who began to visibly falter before he fell against the ropes in a technical knockout, winning Mayweather's 50th undefeated match as the champion boxer swore it was his last fight ever.
But they stressed that the Queen’s husband of almost 70 years had been in ‘good spirits’.
Last night, the Duke was said to be 'up and about' as he spent his second night in hospital.
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It comes amid a major charm offensive by Mrs May in a bid to win the support of Tory MPs and avoid an awkward leadership challenge.