Carpool Karaoke: Demi Lovato and Nick Jonas talk exes

WHAT does "cake by the ocean" even mean?

In the latest Carpool Karaoke with Late Late Show host James Corden, starlets turned superstars Demi Lovato and Nick Jonas pop in to belt out a few hits.

The pair have been friends for a decade but have never dated - a question the singers answer reluctantly under enthusiastic questioning from Corden.

Jonas sheds a little light on how the DNCE track Cake by the Ocean was named after some co-writers and Jonas went head first into a language barrier.

And of course, all three become very Close as the singalong to Jonas' new hit with Tove Lo.