The pop singer caused a stir on Twitter when he posted a photo from the hospital showing Danielle and the baby's heart beats on a monitor.
"#babyjonas is on the way!! Follow dreft for all the updates!!!!!!!!! It's showtime #thisisnotadrill," wrote Kevin to his four million followers. The post was retweeted almost 3,000 times in the first hour, followed by wishes of luck from the couple's fans.
Social media savvy Kevin, 26, and 27-year-old Danielle, have kept their supporters updated throughout the pregnancy.
In August, the brunette beauty revealed that she was expecting a girl by sharing a cute sonogram image of the baby on Instagram.
"I can't believe this is ours @kevinjonas and I are so blessed," wrote the former hairdresser next to another ultrasound image. "Look at that cute nose!!!"
Kevin and Danielle tied the knot on 19 December 2009, two years after they first met on a family holiday in The Bahamas. For the romantic ceremony, which took place at Oheka Castle in New York, Kevin chose his two brothers Joe and Nick to be his best men.