The 28-year-old star and his spouse - who wed last year and are childhood sweethearts from the age of 13 - announced their happy news in a unique and topical manner today (29.10.13) by carving the words 'We're having a baby' into Halloween pumpkins.
The expectant parents shared their baby joy in a YouTube video which saw them carve pumpkins for the annual holiday, and at the end of the clip they finally showed off their finished decorations - revealing the joyous news.
Responding to the flood of well wishes, Tom wrote on Twitter: ''Thank you very much for all the lovely messages. We couldn't hide it any longer...literally! ;) (sic)''
He then quipped: ''Although if the little Fletcher thinks I'm sharing my toys he's/she's got another thing coming! (sic)''
Giovana's brother, Mario Falcone - who appears on British reality TV show 'The Only Way is Essex' - led the congratulations for the happy couple.
He tweeted: ''Yay Uncle Mario :)... Congratulations to my sister @MrsGiFletcher and @tommcfly... Cannot wait! So happy (sic)''
Tom's McFly bandmate Harry Judd wrote: ''Congratulations Tom & Gi (sic)''
Fellow McFly star Danny Jones added: ''Yessss... congratulations to the wonderful @tommcfly and @MrsGiFletcher brilliant news! Love me and @GeorgiaHorsley1 (sic)''
He also slapped a jet-lagged Taylor Hawkins.
The acclaimed performer had just cancelled touring due to a battle with cancer.