Watch: Nick Jonas & Demi Lovato Carpool Karaoke with James Corden

As they prepare for their upcoming summer tour, Demi Lovato and Nick Jonas took a break to stop by "The Late Late Show with James Corden" to take a ride in his Carpool Karaoke.

After hitting it with "Heart Attack," Jonas recalled a story of a fan from his Jonas Brothers days who once hid in the van with his luggage.

"Do you think they went through your bags," Corden asked of the overly amorous fan.

"Maybe they found your purity ring," Lovato chimed in.

Jonas' hit "Chains" was next on the program.

"Have you ever been tied up?" Corden asked.

Jonas recounted an experience playing a gay club.

"The literally chained me to the wall as I'm performing the song. It was very, very erotic," he said.

Lovato and Jonas will kick off the co-headline "Honda Civic Tour: Future Now"�this June. For ticketing information and a full listing of concert dates visit: www.futurenowtour.com