Chris Evans and his wife Natasha have welcomed son Eli Alfred Michael Evans into their lives.
Chris missed his Radio 2 Breakfast Show on Friday morning after his wife went into labour.
The One Show's Alex Jones had to stand in as main host of the programme, which was being broadcast from Hay-On-Wye.
Presenter Chris, 46, already has a son Noah, three, with golfer wife Natasha and a daughter Jade - now in her mid 20s - from an earlier relationship.
The couple met when they were partners in a celebrity golf tournament and married in 2007.
Chris announced the news on Twitter: "Eli Alfred Michael Evans says hi ! Can't wait to join you all out there."
The presenter also told fans he will be presenting his usual slot on the One Show in the evening, despite the new arrival:
"Thx so much for al the twitter Eli love. It's gonna be one hell of a wekend !! Pint ! After The One Show of course. Xxxx." (sic)
Photo: © Chris Evans