Who can forget Season 6 Episode 2 titled 'Buffalo Gals?' We sure can't.
It's the one where Kelly celebrates her 21st birthday at a Dave Koz concert.
So naturally we had to get to the bottom of how this cameo happened.
World renowned artist Dave Koz comes on to tell us about his appearance on the show and all that jazz.
Plus, find out how his current gig takes him around the world and you can join him!