The 'Mysterious Girl' singer confirmed on Monday (27 January) that he had popped the question to trainee doctor Emily and fans were quick to react in their droves with well-wishes.
A thrilled Peter tweeted in response: "We are so grateful to everyone for their lovely comments. Thank you all very much. We are so happy right now! :))) (sic)."
It's been a very good month for Peter and Emily as they welcomed their first child together on 7 January.
Emily gave birth to their baby daughter at Musgrove Park Hospital in Taunton, Somerset, with Pete by her side.
The new arrival has yet to be named, with Peter telling fans recently he wanted his children Junior, eight, and Princess, six, from his marriage to ex-wife Katie Price, to be involved in the decision.
After being asked by a fan on Twitter about the baby's name, Peter replied: "Haha she is a mysterious girl. No name yet. Still have time. Want the kids to help choose :)) (sic)."
Baby Andre-MacDonagh arrived a bit earlier than expected but safe and sound. News of the birth was first leaked via Twitter on 9 January by fellow hospital visitors who claimed to have seen the famous couple in the vicinity.
Peter then confirmed the news via Twitter, saying he'd wanted to tell his children the happy news before informing the public.
"Now that I have had the opportunity to tell Junior & Pringles, we are very happy to announce the safe arrival of our beautiful baby girl:) " he said. "We are extremely thrilled and mum and bubba are doing fine. We are looking forward to a nice quiet couple of weeks getting to know our baby (sic)."
After being inundated with messages from fans, proud new dad Peter tweeted on 14 January: "A massive massive thank you to everyone who has sent congrats and well wishes. She's such a beaut. Love you all lots."
Celebrities who have welcomed babies in 2014 in pictures:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/Joe