"Lola Rose Emma Judd entered the world at 8:43pm 25/1/16. Both Mummy and Lola are doing very well. Izzy is my hero and I love my girls," Harry announced to his legions of fans on Twitter, adding some heart emoticons.
Hours later the new dad gave fans a little update, writing: "Lola is asleep on my chest. I'm in heaven". Just days before the singer had tweeted: "Every night I go to sleep hoping Izzy will wake me up in the middle of the night having gone into labour. Here's to another night."
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Harry and Izzy Judd have welcomed their first baby
"In an ideal world when you're ready to start a family you hope you will conceive in the first few months of trying," said Harry. "We were like, no, no we won't need IVF, it won't be us. IVF was like something you didn't talk about. We thought it would be fine."
"Every baby is a miracle but we do feel so very lucky," said Izzy, who suffered a miscarriage from their first attempt at IVF last year.
"Every baby is a miracle but we do feel so very lucky," said Izzy
The couple, who married in 2012, attended hypnobirthing classes, following in the footsteps of Harry's bandmate Tom Fletcher and his wife Giovanna, who welcomed their first child Buzz using the same method. The Fletchers are now expecting their second baby, and again plan to have a hypnobirth.
Izzy celebrated her baby shower in December, surrounded by her family and friends including the McBusted family.
The new mum admitted she had repacked the hospital bag "for the 100th time"
Giovanna gave an insight into the party, writing in her HELLO! Online blog: "Yes, it was time for Izzy Judd to be made a fuss of before Baby Judd arrives early next year.
"Izzy and Harry have publicly shared their emotional journey into parenthood, so needless to say I couldn't wait to see Izzy surrounded by baby goodies while we all predicted the baby's sex, weight and birth day."
Harry and Izzy turned to IVF treatment to conceive their baby
In the lead-up to the birth Harry and Izzy shared their updates with their fans, with the mum-to-be admitting that she had repacked the hospital bag "for the 100th time".
The couple also enjoyed plenty of downtime, enjoying walks in the park and cuddles on the sofa. "Enjoying our last few days as a 2 piece," Harry captioned a sweet selfie of the pair in mid-January.