JK & Lucy chatted to Ant & Dec

Find out who's the shortest & tallest when JK & Dec had a height-off

JK & Lucy were very excited to have Ant & Dec pop by for a chat about their 'Ant & Dec Takeaway Tour' coming next year!

While they were in the studio, little JK challenged Dec to a height challenge....

JK's been going on and on that he's taller than Tom Cruise & Dec for years, so today was the day to prove once and for all who's taller!

Check out the video of the boys going back to back and the reaction to the result!