When one of his followers joked would he had the middle name Ventura, as in Jim Carrey's character Ace Ventura, Matt replied: 'Nearly! Went for Billy so if he want to be like a f**king banker or something he can use that instead!'
Although his wife Emma was tweeting as normal over the weekend and didn't mention giving birth, when one followers asked how she was feeling, she wrote: 'Knackered...'
The little boy joins big sister Isabella Catherine, two.
TV presenter Emma Willis is celebrating after giving birth to a bouncing baby boy. She and singer/actor husband Matt Willis, 28, welcomed a son Ace Billy Willis on Friday.