The talents of two major divas — one contemporary, one classic — came together in Chicago on Tuesday as Ariana Grande dropped in for a duet at Barbra Streisand’s United Center concert.

The two traded lines of “No More Tears (Enough Is Enough),” Streisand’s high-energy single with the late Donna Summer that topped the Billboard chart in 1979, 13 years before Grande was born.

Grande apparently stuck around town after her Sunday closing set at the Lollapalooza festival in Grant Park.

The mutual admirers were pictured together in a photo both singers posted on their respective Twitter accounts after the show.