The actor, famed for his role as Carlton Banks in the hit 90s sitcom, The Fresh Prince Of Bel Air, welled up he came to terms with his victory alongside Witney.
With everyone around him, Alfonso, who brought back the much loved Carlton dance, when he performed it on the show, said: "I cannot believe this. I've wanted it forever. My god, I don't even know what to say." Well, he didn't have to say anything because we thought the star was a winner from the start!
However, the competition hasn't been easy for Alfonso, who was visited with members of the Fresh Prince cast, as he was blighted by a back injury.
But despite the pain, Alfonso danced through it. He even got the support of pal Will Smith who took to Facebook to tell his fans to vote for Alfonso.
Back to last night's show and last night's finalists didn't bow out without a good fight.
All three routines managed to rack up a trio of perfect 40s. Sadie Robertson and her partner Mark Blass' quickstep was by far their best routine of the season and we all have to agree that there really is no one who has grown so much throughout the competition.
She may have played it safe last night with her simple quickstep but she played it brilliantly, which didn't go unrecognised as Len Goodman said she represented the show's "Cinderella story".
Janel Parrish and her partner Val Chmerkovskiy were next and despite their perfect 40 from the judges, we weren't as blown away by their foxtrot as the panel.
But it's those judges who count, who found their performances - which we've seen a thousand times over - "riveting," according to Julianne Hough who said that she wished the pair just kept on going. We're kind of glad they didn't.
And saving the best for last, Alfonso strode out on to the dancefloor for his cha cha and tango, loving every single minute of it.
