The Chainsmokers Bring Out Backstreet Boys & Big Sean, Debut New Song in Los Angeles: Watch

The Chainsmokers in 2016
Theo Wargo/Getty Images for iHeart Media

The Chainsmokers perform at Nikon at Jones Beach Theater on June 4, 2016 in Wantagh, NY. 

The Chainsmokers welcomed special guests the Backstreet Boys to the stage during their Los Angeles Convention Center concert Friday night (Dec. 30). At the duo's headlining gig, presented by Insomniac and Exchange LA and their biggest to date, the boy band sang late '90s hits "I Want It That Way" and "Larger Than Life."

"Stoked we got to share the stage w/ @thechainsmokers tonight! Congrats on your huge La Convention Center gig... and thx for having us," Backstreet Boys tweeted.

Meanwhile, the Chainsmokers tweeted: "A massive thanks to the Backstreet Boys for smashing it so hard! Yall stole the show!"

Check out a fan's clip of the performance below, as well as video of an appearance by Big Sean. "We were taking notes watching you!" the Chainsmokers tweeted, thanking the rapper for showing up.

The L.A. show also featured the Chainsmokers performing a new song about Paris, which the duo says will be out "soon,"

We were staying in PARIS @TheChainsmokers #LACCdreaming

— sam -- (@yagirlsv) December 31, 2016