The couple announced their happy baby news via a very sweet Halloween-themed video where they carved pumpkins to spell out the words: 'We're having a baby.'
Giovanna joked ahead of tweeting the video: "Sometimes the best way to share something is with a pumpkin... Some Fletcher news for you..."
No further details about the impending arrival have been released.
Tom and Giovanna married in London in 2012 in front of friends and family including Tom's McFly bandmates and Giovanna's TOWIE star brother Mario Falcone.
Mario was among the first to tweet his congratulations to the parents-to-be, writing: "Yay Uncle Mario :)... Congratulations to my sister @MrsGiFletcher and @tommcfly... Cannot wait! So happy."
Congrats to Tom and Giovanna!
Watch Tom and Giovanna's baby video here:
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Copyright: Vimeo / Weiss Eubanks