People of a certain age will recall a time when Justin Timberlake was not only one of the biggest pop stars on the globe, but a wee curly-headed, badly-dressed member of *N Sync. (If not, they were a boyband. Ask your mum.)

Kelly Clarkson is old enough to remember the days when Backstreet Boys and *N Sync ruled the charts - and the singer made her allegiance known at a gig in New York the other night, when she covered the latter's hit 'Bye Bye Bye' at the request of a fan.

All told, she does a pretty good acoustic version of it. If you're into that sort of thing. Which we're definitely not. Anymore.

Watch it below: