Michelle Obama surprised the crowd at the BET Awards Sunday when she appeared in a pre-recorded video message congratulating Chance the Rapper on winning the network's Humanitarian Award.

"In addition to making some really amazing music, Chance has been taking that big, bright spotlight that follows him around and he's shining it on young people in our hometown of Chicago," Obama said. "Time and again he has been standing up, speaking out and doing the work to get kids in our community the education they deserve.

"And with these passionate efforts, Chance is showing our young people that they matter. That they have something inside of them that is worthy of being expressed, and that they have so much to contribute to their communities and to our country."

"I can think of no better legacy to leave, and I am thrilled to celebrate you here tonight and honored to call you my friend," Obama continued.

At 24, the rapper is the youngest person to receive the BET Humanitarian Award and won for the philanthropic work he's done in Chicago, where both he and the Obamas are from.

In March, Chance the Rapper donated $1 million to Chicago Public Schools, and has raised more than $2 million for Chicago schools through his nonprofit, SocialWorks.