The Grammy award winning singer put on former Washington Capitals defenseman Karl Alzner's jersey during a show at Capital One Arena in D.C.
Alzner brought his jersey to Bublé's show as a gift to the singer.
"Well ladies and gentlemen, what you don't know but what I know, this isn't just a jersey," Bublé said in a Twitter video posted by the Capitals. "This isn't just a Washington Capitals jersey. This is a Capitals jersey given to me by my buddy, who was a draft pick in 2007, played for your Washington Capitals for nine years before the old Stanley Cup came here. Beautiful Karl Alzner just gave me this. Thank you, Karl."