The proud parents both revealed the news on their twitter pages this morning, with Tom writing: 'Yep, @MrsGiFletcher gave birth to our insanely gorgeous son yesterday at 7pm. He is healthy, beautiful and I've already changed his nappy.'
Tom, 28, also apologised for his social media silence as he was 'too busy cuddling my son.'
Giovanna Falcone and Tom met when they were just 13 years old at the Sylvia Young Theatre School. In April 2011, romantic Tom took her back there to propose to her on the spot where they first met.
They were married in May 2012 and announced they were expecting a child in October of 2013 - using the novel method of pumpkin carving.
Posting a video to their social media pages - the couple are seen carving away at pumpkins at Halloween, before they turn them round to reveal the message 'we're having a baby.'
In January 2013, Fletcher uploaded a video of his wedding speech, sung to a medley of McFly's songs, which received 12 million views on YouTube.
Congratulations to the happy family!