Gavin Rossdale says wife Gwen Stefani told him about her third pregnancy in an e-mail while he was on the road Credit: Bryan Bedder/Getty Images

You've got mail, Gavin Rossdale! Gwen Stefani's rocker husband revealed on Howard Stern's radio show on Tuesday, Sept. 9, that his wife broke the news of her third pregnancy to him via e-mail, while he was on tour with his band, Bush.

"By the way, you had another kid. I was surprised," Stern said to the father of three. "I thought you were done."

"Me too," Rossdale, 48, quipped. "I got this email on the road, from Gwen, and the title was in capitals, 'LOOK WHAT YOU DID TO ME NOW.' I was like, 'What is this?' My blood pressure went through the roof. And I opened the e-mail, and it was the pregnancy stick.'"

The musician said, too, that he knows when the baby was conceived. "I wasn't home that often, but I did go home for Father's Day," he told Stern. "And that gives Father's Day a new meaning."

As previously reported, the No Doubt singer and her spouse of nearly 12 years welcomed their third son, baby boy Apollo Bowie Flynn, on Feb. 28. He joined big brothers Kingston, 8, and Zuma, 6. 

"He's pretty chilled out," Brit rocker Rossdale told Us of his youngest son in June. "We're very proud of him. He's a great kid [but] he'll be naughty soon enough!"