The 39-year-old singer has only been dating sexy Emily MacDonagh - who, at 23, is 16 years younger than him - for three months but he is convinced she is the right woman for him and admits he hasn`t been this happy for years.
Peter - who met the Australian beauty after her father Ruaraidh, a urology consultant, performed emergency surgery on him to remove kidney stones two years - told The Sun newspaper: "Before, I was dating and going out and having fun, but I felt empty. Very early on in our relationship, I felt that gap had been filled - this is the happiest I have been in years.
"Emily`s amazing. It`s still early stages and it`s going great so I don`t want to jinx it. But I miss her when I`m not with her.
"I just love spending time with her. She is my breath of fresh air.
"And I`ve always wanted to remarry, settle down and have more kids."
Peter - who has two children, Junior, seven, and Princess Tiaamii, five, with his ex-wife Katie Price - has even written a song about Emily on his new album `Angels and Demons`.
He revealed: "`Fly Away` is all about Emily. That song is exactly about us. The only things I have done that are personal are the positive things."
Peter`s feelings for his new girl have even convinced him to scrap a planned boys-only trip to Las Vegas next year to celebrate his 40th birthday.
Instead, the `Behind Closed Doors` hitmaker is going to do something else to mark his special day which includes Emily.
He said: "I`ve decided not to go to Vegas, as all the stuff I`d have done, I`d have done as a single guy. But I feel I`m turning 30, I don`t think I look 40. Age is just a number. If you are 80 and rocking it in nightclubs you might have to think twice - but turning 40 to me is nothing."
Peter`s former spouse Katie split from her fiance, Argentinean model Leandro Penna, last week after a two-year relationship.