Kelly Osbourne: Dancing with the Green Day

10/20/2009 5:00 PM PDT BY TMZ STAFF
Here's Ozzy Osbourne's celebuspawn turned "Dancing" diva Kelly Osbourne on that show (left) -- and Billie Armstrong of Green Day performing in Glasgow on Monday (right).

Kelly Osbourne and Billie Armstrong

One of them had an unsuccessful music career.

We're just sayin'.