The singer performed for a few hundred people Thursday night at New York's Gotham Hall. The diva downplayed her return saying, "I didn't realize this was a big deal."
The concert was one of four shows Thursday dubbed "Plot Your Escape: Four Concerts. Countless Celebrities. 1 Epic Night," by Caesars Entertainment.
Diddy joined Carey in New York while Lil Wayne and Cee Lo performed in Los Angeles, Maroon 5 and Sara Bareilles in Chicago, and Mary J. Blige and Gavin DeGraw in New Orleans.
The Associated Press contributed to this report.
