No one loves to give Simon Cowell grief as much as Demi Lovato...except maybe David Walliams.
So we love this video of the pair joking about Simon's lateness to set and the many other joys they have working with him.
Check out the cheeky quips below...
We wonder what Simon had to say about this all...
We think David and Demi togeother on a panel with Simon would be his worst nightmare ( or the best thing ever).
What do you think?
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