Madonna's Boyfriend Josh Popper Joins Her Onstage at Celebration Tour in New York

The Material Girl's boxer beau sat beside her during a performance of "Vogue"

Madonna’s boyfriend Josh Popper is getting into the groove, with over 14,000 fans cheering him on!

The boxing coach was a special guest at the pop star’s Celebration Tour stop in Brooklyn, New York, on Wednesday night. He joined her onstage at the Barclays Center to serve as a judge during a performance of her 1990 classic, “Vogue.”

Popper, 30, and Madonna, 65, who have been linked since February, sat beside one another and held up score cards as dancers performed sexy ballroom moves on a catwalk. The two could be seen fanning the performers with the score cards, swaying back and forth and letting their bodies groove to the music.

They even shared a kiss during the musical moment.

Related: Elton John Says He's 'Deeply Moved' by Madonna's 'Heartfelt Tribute' to Lives Lost to AIDS in Celebration Tour

While Madonna rocked her onstage attire in the form of a shiny silver fitted costume, Popper opted for something a little simpler as he wore a black Diplomats Decide graphic t-shirt and jeans.

Popper was the latest guest judge in the segment, as Madonna has previously invited pals such as Debi Mazar, FKA Twigs, Donatella Versace, Julia Fox, Arca and Diplo, among others.

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The Material Girl’s man also had a moment earlier in the show, appearing in an on-screen video that played to the crowd while she performed her 1992 song, “Erotica.”

She and Popper, who owns a New York City gym called Bredwinners, went Instagram official in February. They’ve since made several public outings together, including at one of his N.Y.C. matches and at a piano recital in April.

Related: Madonna Joined Onstage by Five of Her Kids at the Celebration Tour Launch in London — See Photos!

The Brooklyn concert, which followed a run of dates in Europe, marked Madonna's first performance of the tour's North American leg as she aims to finish 79 stops in total before wrapping up in Mexico in April.

Madonna kicked off her long-awaited world tour in London in October. During opening night, she reflected on her “crazy year,” which included a hospitalization over the summer for a serious bacterial infection.

"I didn't think I was gonna make it. Neither did my doctors. That's why I woke up with all of my children sitting around me. I forgot five years of my life, or my death, I don't really know where I was. But the angels were protecting me, and my children were there. And my children always save me every time," she said of Lourdes, 27, Rocco, 23, David, 18, Mercy, 17, and twins Stella and Estere, 11.

"If you want to know my secret and you want to know how I pulled through and survived, I thought, I have to be there for my children. I have to survive for them."

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