This past Friday was a day that Darius Rucker will never forget. He donned a cap and gown at a college graduation, only it was not his -- he was the commencement speaker at the Medical University of South Carolina. He spoke in the university's Horseshoe, where about 800 men and women received degrees from the university's six colleges.

The country star told the crowd, "I'm a dreamer. When I was a kid I dreamt about grades, I dreamt about records -- selling a lot of records -- and I never let myself dream that someday somebody would ask me to come speak to MUSC graduates. This is an honor for me. Thank you so much for trusting me with this humble task, and I want to make you proud."

Earlier that day, the 'This' singer was given an honorary diploma, and he gushed with pride as he told the students, "I got a Doctorate of Humane Letters. I'm a doctor!" Rucker will hang the diploma in the foyer of his home. He explained, "That way everyone will know to all me Dr. Rucker." He added, "The first person in my band that does not call me 'Dr. Rucker' does not have a job!"

Rucker is involved in many charitable causes, and he serves on the board of the MUSC Children's Hospital Fund with his wife, Beth. The singer's mom is a longtime MUSC employee as well, so the University was a huge part of his life growing up. After Rucker's wife recently told their kids that their daddy was going to be a doctor, his kids laughed that he did that without ever having to go to school.

As previously reported, Rucker will be part of the star-studded lineup at the Bama Rising: A Benefit Concert for Alabama Tornado Recovery on June 14 at BJCC Arena in Birmingham, Ala.

Watch Darius Rucker As He Delivers the MUSC Commencement Speech