Chaka Khan and Stevie Wonder headlined Prince‘s tribute concert at Xcel Energy Center in St. Paul on Thursday night.

The legendary singers rocked the crowd and had them “partying like it was 1999” despite the fact that other scheduled performers pulled out at the last minute.

Via Page Six:

Khan brought Wonder onstage Thursday night at Xcel Energy Center in St. Paul to duet on Prince’s “I Feel for You,” a 1984 hit for Khan. Wonder, wearing a suit and purple shirt, got the sold-out audience cheering with his signature harmonica riffs before the two performed Prince’s hit “1999,” with the crowd clapping and dancing along.

Just before showtime, Christina Aguilera canceled due to a “vocal illness.” John Mayer canceled because of his “schedule,” and no one knows why Anita Baker was a no show.

Jessie J stepped in to replace Christina and sang the venue down!

Despite the tomfoolery, the concert was still a success!