In case you don't know by now, Carpool Karaoke is a segment on The Late Late Show where James Corden invites musicians to drive around LA with him, singing songs and just having a chat.
They started the drive by discussing Demi and Nick's past dating lives, which you will be more than familiar with if you were a fan in the mid-'00s.
Seriously, the dating life of '00s Disney Channel teens was more complex and way more exciting than a soap opera.
But, as many people know, this was all during a time when Nick and his brothers were wearing purity rings. So Nick explained why he eventually decided to take his off...
Of course, they eventually did some singing, like to Demi's song "Heart Attack", and "Cake by the Ocean" by Joe Jonas's band DNCE.
But they also threw together some harmonies for Nick's song "Jealous", and it was pretty damn impressive, tbh.
So they decided to form a band, and took to the streets of LA for an impromptu performance.