Mayweather enjoys first night out since beating Pacquiao at Chris Brown's birthday bash in Las Vegas club

Floyd Mayweather was pictured partying for the first time since defeating Manny Pacquiao at the MGM Grand last Saturday, and the undefeated world champion's choice of venue was far from inconspicuous.

Mayweather, who was there with girlfriend Shantel Jackson, treated his Money Team and his esteemed guests to unlimited champagne at Las Vegas' super-club Drai's, as Chris Brown performed on his birthday at the crowning jewel of The Cromwell Hotel.

Soaring 11 stories high on the famous corner of Las Vegas Boulevard, the 65,000 square foot beast features swimming pools, private cabanas and an unrivaled view of the famous Strip.

Floyd Mayweather (right) was in fine form on a night out in Las Vegas after his points victory on Saturday

Mayweather, who is also known as the Money Man, counts his $100 bills during his night out in Las Vegas

Mayweather attended the party with his girlfriend Shantel Jackson 

Mayweather smiles as he holds onto another girl while his girlfriend watches

Mayweather holds up a wad of cash as he celebrated Chris Brown's 26th birthday at Drais nightclub

Mayweather talks to his invited guests at the plush Las Vegas Boulevard venue 

Floyd Mayweather leaves Chris Brown's Vegas birthday party

This was the perfect venue for Mayweather to flaunt his wealth once more, at the home of where partying in Las Vegas is being redefined.

The rooftop oasis, which stays open until 4am, was the venue for 'Cinco De Mayo', the official celebration of F.A.M.E. singer Brown's 26th birthday, where 'fashionable swimwear' was highly encouraged.

Drai's delivers on its promise as the most luxurious late-night party spot with its luxe leather seating and swanky surroundings, but with champagne bottles for spray only fetching $2,000 for 10, and firework displays from $9,000 per 30 seconds, this is a home for only the wealthiest of guests.

Mayweather treated his Money Team and his esteemed guests to unlimited champagne at super-club Drai's

Mayweather attended the club as part of singer Brown's (right) 26th birthday celebrations

Brown performed on his birthday at the crowning jewel of The Cromwell Hotel

After overcoming Pacquiao in fine style, making it 48 wins from 48 professional fights, Mayweather had plenty to celebrate, and it seemed his ex-girlfriend's potential lawsuit against him for defamation was the least of his concerns.

'Money' claimed that Josie Harris was on drugs during a domestic violence incident in September 2010. But he put the potential lawsuit to one side as he splashed the cash at the dimly lit late-night party spot.

The rooftop oasis was the venue for 'Cinco De Mayo' the official celebration of Brown's 26th birthday

The 65,000 square foot beast features swimming pools, private cabanas and an unrivaled view of the Strip

After beating Manny Pacquiao on Saturday, Mayweather took his professional record his to 48 wins out of 48

Mayweather has one more contracted fight with television company Showtime in September