Watch Jordin Sparks join Chris Brown onstage for nostalgic performance of duet 'No Air'

How do Jordin Sparks and Chris Brown expect us to live with this sucker punch of 2000s nostalgia?

Sparks joined Brown to sing their aughties duet "No Air" as part of the finale for Brown’s One of Them Ones tour, which wrapped Saturday in Las Vegas. The two grooved together onstage as they sang the emotional chorus to the R&B midtempo track.

"15 YEARS LATER: (Chris Brown) and I returned to the stage to perform No Air," wrote Sparks on Instagram. "Thank you Chris for having me at the final stop of your ‘One of Them Ones’ tour, ended it with a bang in Vegas!!!"

Sparks added: "The crowd was lit!!! Loved hearing you scream every word of this song!!! My heart."

Surprise!: Billy Joel brought out Def Leppard's Joe Elliott for 'Pour Some Sugar on Me' in Detroit

People online couldn’t get enough of Sparks and Brown’s melodic magic either.

"I remember one summer in NYC, my friends and I were in her apt with no ac, hot and miserable and just broke out singing this song," wrote author Dzung Lewis under the comments section of Instagram. "Random but it was the best summer and this song will always bring me back there."

"Y’all better sang!!!" commented actress Yvette Nicole Brown.

"Yasssss so legendary," wrote singer/songwriter Candace Wakefield.

"One of my favorite songs! Your voice is incredible!" commented activist Dominick Thompson.

Featured on Sparks' platinum, self-titled debut album, "No Air" was released in 2007 and peaked at No. 3 on the Billboard Hot 100. The song also earned Sparks and Brown a Grammy nomination for best pop collaboration with vocals at the 51st annual Grammy Awards in 2009.

Brown's popularity took a turn in February 2009 following his assault of then-girlfriend Rihanna. He pleaded guilty to two felony counts stemming from the altercation and was sentenced to 180 days of community labor and five years of probation.

In an interview with CNN in 2011, Sparks opened up about her willingness to work with Brown again despite the controversy surrounding him.

"I know people are very critical, but I think he's really trying and he's getting there. He's doing things that he says he's going to do," Sparks said. "I think everyone deserves second chances. I'd love to work with him again."

Sparks, daughter of NFL veteran Phillippi Sparks, rose to stardom as a teen hopeful on "American Idol," winning the sixth season of the reality singing competition at 17.

Her latest album, "Cider & Hennessy," was released in November 2020.

Watch: Taylor Swift join HAIM onstage for a 'mashup' of 'Love Story' and 'Gasoline'

This article originally appeared on USA TODAY: Jordin Sparks reunites with Chris Brown, sings 'No Air' duet: Watch