Usher celebrated his 35th birthday Monday night at Los Angeles hot spot Bootsy Bellows.
Joined by friends Sean "Diddy" Combs, Justin Bieber, Sugar Ray Leonard, Ashley Benson, Jermaine Dupri, T.I., Blake Shelton, David Arquette, Miguel and Cassie, the R&B star arrived at the surprise bash around 11 p.m., and he was ready to party.
Dressed in a blue button-down, blue pants, pony-hair camouflage sneakers and a Gucci fedora, the birthday boy dominated the dance floor, according to onlookers.
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After watching the Miami Heat beat the Indiana Pacers to win the NBA's Eastern Conference Finals in Game 7 on Monday, Justin Bieber had a night out on the town.
The pop star, who is staying on South Beach at the SLS Hotel, visited Mansion for the nightclub's Hot Excess Mondays hip-hop party.
“Justin arrived at 3:45 a.m. with three SUVs of friends, including Young Money artist Lil Twist,” a source tells PEOPLE.
Are Justin Bieber and Selena Gomez back together?
The on-again and off-again couple was spotted at Cirque du Soleil's Love together on Saturday at the Mirage in Las Vegas – just a day before place cards revealed they may sit next to each other at Sunday's Billboard Music Awards.
Just before the show started, Bieber tried to inconspicuously enter the building, but someone noticed him and yelled his name, an onlooker tells PEOPLE.
As soon as the show began, the "Come and Get It" singer was "nuzzling right into" Bieber, the source adds.
Justin Bieber's having a lot of fun in the City of Light.
The singer – who arrived in Paris on Sunday – stepped out with friends Cody Simpson, Teddy Jay and Emma Boukari to take in the sights including the Eiffel Tower, the Arc de l'Triomphe and the Moulin Rouge on Monday.
The 19-year-old arrived at the home of the French Can Can, wearing his glasses and a baseball hat, after the evening's first performance had begun. After running a gauntlet of umbrellas in the rain he joined family and tourmates at Paris's longest-running cabaret show.
The private party had been set up over the weekend according to spokesperson Fanny Rabasse. "It was arranged three days ago for his tour members including some of his dancers," the cabaret's PR Manager tells PEOPLE. "It was a group booking of 23. We have 900 places so it really wasn't any problem for us."
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