"I was overjoyed," Kevin told E! of learning the news. "It's been the most exciting thing in my life so far."
"I'm excited and I'm nervous," he added.
Having a baby was often a topic of discussion on most recent episodes of their E! reality show, "Married to Jonas."
"We're just waiting for the right time," Danielle said last year, "And to have enough time to spend with the child and not miss everything about them growing up."
Both Kevin and Danielle tweeted enthusiastically about the news on Twitter Tuesday, with the trending hashtag #babyjonas.
It's true! We r expecting. So excited to share this amazing news with all of you! Tune into E!News 2nite for the official announcement @ 7pm— Danielle Jonas (@daniellejonas) July 9, 2013
Iam so happy to tell everyone it's been so hard keeping this news in !!!— Danielle Jonas (@daniellejonas) July 9, 2013
It's true @daniellejonas is pregnant! can't even imagine how excited we are I can't wait to share this with my best friend. I love you baby.— kevin jonas (@kevinjonas) July 9, 2013
Celebrity Families of 2014 [PHOTOS]