In an exclusive interview with PEOPLE, Mariah Carey says she can't be called a diva because she returned to the crowd to greet Rihanna at her Tuesday, Dec. 17 show in Brooklyn.

After spotting Rihanna in the crowd at the final stop on her Christmas Time Tour, Mariah Carey walked over to the singer and gave her an autograph she'll never forget.

All Rihanna wanted for Christmas was an autograph — on her breast, from Mariah Carey, right after the latter’s hotly anticipated Brooklyn holiday concert. The Fenty founder, 36, flagged down the “All I Want for Christmas Is You” crooner,

Time tour wrapped up with a major bang, and guess who was in the crowd? Rihanna. The "All I Want For Christmas" queen performed her final show at New York’s Barclays Center on December 17, and, naturally,