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Everyone has become obsessed with James Corden's Carpool Karaoke, but what really happens behind-the-scenes while filming in the little car? 

While chatting with Elvis Duran and The Morning Show, Nick Jonas revealed how he had to sacrifice his comfort for the sake of being funny while recently doing the skit with good pal Demi Lovato.

"It's SO hot in the car! No one knows this...I'll give you the whole scoop," he explained. "Basically, because they're recording sound, they can't have the A.C. on, and at that point in the year, which was like a month and a half ago, it's really hot in L.A. So for some reason I decided to wear this jacket with another thing on top of it, this whole thing, and I'm just sweating in the car, and Demi keeps looking back at me like, 'What's the matter with you?'"

He tried to brush it off, but he was a little worried the heat was going to mess up his memorization. "You want to make sure you know the words to Demi's song, she knows the words to my songs, and he knows the words. It's an interesting thing."

Despite his concerns, it turned out great, and they all had a good time. "It is one of the most fun shows I've done ever, and James is the best," he said. "It's great to see people you admire, that you like their music or whatever, up there making a fool of themselves and having fun. He says before you start shooting too, 'Don't try to sing funny, really go for it! Act like you're playing the Garden.' He's all about it!"

Nick also go to talking a bit about a more serious topic: the Orlando shootings and his speech at the vigil in New York Monday night.

Nick Jonas, Young Hollywood Awards

Stefanie Keenan/Getty Images for Variety

"The LGBT community has been so supportive of me," he said. "I didn't prepare anything I just walked up and spoke…I cannot imagine the pain that the families of the victims feel and I humbly say that I'm here to support in any way that I can, and I'm so, so sorry for them."

He continued, "It's incredible to look out, and I was trying to describe it to a friend last night, but you look out and you see those faces and you see the passion, and it's directed at a real bravery that this area shows every time tragedy hits, which is I think my favorite thing about New York and New Jersey, it's a beautiful place where people in times of real tragedy speak up and know how to make a difference and make a change."

He also touched on his relationship with Christina Grimmie, who was shot and killed at an Orlando venue during a fan meet-and-greet on Friday, and how that affected him as a performer.

?? #ripchristina

A photo posted by Nick Jonas (@nickjonas) on

"Christina Grimmie is just really heartbreaking," he said, solemnly. "I had the chance to meet her at the iHeart Festival last year. She introduced me on stage and we talked back stage for a while and took a picture and you could tell she's a beautiful spirit and full of joy and light. That kind of shook me up pretty bad and I think it's something that needs to be addressed across the board and it's not just specifically in meet and greets, because obviously the horrible tragedy in Orlando the next day, I think it's just an issue we need to sort out as a country and get right."

Still, despite the tragic events the took place over the weekend, Nick says he's proud to be an American and will continue using his platform to speak out.

"I'm grateful to have a platform to be able to speak about things I'm passionate about," he said. "I'm humbled and honored last night to have been able to be part of it in any way and all I can say is I do intend on doing all I can to see a change and I'm proud to be an American, I think we all should be.