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Ariana Grande

BPM

We sure hope Ariana Grande got some sleep today.

Not only did she perform on the season premiere of Saturday Night Live last night, but things for the pop star didn't end until about four in the morning.

Grande made a surprise appearance at gay nightclub BPM at 3 a.m.!

Dressed in a white miniskirt, a bustier and matching heels and her signature cat ears, Grande and her dancers performed "Bang Bang" and "Break Free" for a crowd of about 2,000 people. "They went wild," a source tells me.

Not only was her brother Frankie Grande with her, but so was her boyfriend Big Sean!

Ariana Grande

BPM

Ariana's gay fan base hits close to home. Her brother, who was a contestant on Big Brother, is openly gay.

In fact, Ariana blasted someone last month for referring to Frankie as "that homo" on her Instagram.

"'That homo' is the fiercest, most incredible, funniest, most intelligent, kind hearted and most LOVED person on the face of the planet!," she wrote. "he also cleaned up his game and told the truth to everybody in the house WHICH by the way, nobody else on the show has done. so i don't give a flying f--k if or when he comes home!!! he is incredible and i am SO prud!!!!"

She summed things up by snapping, "oh and also ‘that homo' gets more ass than you'll ever get in your life. k miss thing?"

Earlier in the evening, Grande was SNL's musical guest. She sang "Break Free" and "Love Me Harder," a duet with The Weekend.

Ariana Grande

BPM

After her latest album, My Everything, debuted on the top of the charts, the singer announced plans for a massive North America tour.

Beginning February 25, 2015, Grande will hit the road and stop in 25 cities for the Honeymoon Tour. Rixton will serve as the opening act.

Grande has reportedly been dating Big Sean for at least a month.

"That Ariana is very, very special," Sean said during an appearance Friday on On Air With Ryan Seacrest. "She's very special to me. Everything she has going on is good with her, everything I have going on is good with me, everything between me and her is good, and I'm just going to leave it at that."