The crowd cheered on 16-year-old Frankie Antonelli as he sang his heart out to Rucker's hit, "While I still Got the Time."
Then, to Frankie's surprise, the former Hootie & The Blowfish frontman appeared onstage halfway through the act. The two finished then ballad together.
Frankie's mother, Debbie, posted a photo of the singing duo on Twitter after the performance. She also tweeted a message to people who discredit Frankie's abilities because of his Down Syndrome.
Can't count how many people told us Frankie can't/won't because he has Down Syndome. WRONG! He can and will. Thanks @dariusrucker— Debbie Antonelli (@debbieantonelli) November 21, 2013