As the couple celebrate the singer's 41st birthday on 27 February we take a look back at their touching love story.
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The media personality recently spoke exclusively to HELLO! about his Valentine's Day plans for 23-year-old Emily, who is the mother of his daughter Amelia.
Peter has described Emily, who is a medical student, as "a natural" when it comes to motherhood. Their engagement came last month, three weeks after the little girl's birth on 7 January. The duo are planning two traditional weddings - one in keeping with Peter's Greek Cypriot origins and an English ceremony.
"I want to do a traditional English wedding, to the finest detail," the media personality revealed. "Then I want to go to Cyprus and we want to smash plates."
Although the nuptials won't be for a few years since the smitten duo have their hands full - Peter is father to two other children from his marriage to Katie Price, eight-year-old Junior and Princess Tiaammii, six.
Meanwhile, the new mum is keen on practising medicine. A source close to the couple said: "She still wants to have a career as a doctor, so it is very unlikely that she will be a stay-at-home mum."
The pair met in 2010 after Peter fell ill with kidney stones and was treated by Emily's father Ruaraidh MacDonagh.
Ruaraidh, known as Ru, is a urology consultant and also operated on Peter's dad, Savvas. "Peter became very close to him and his family and his relationship with Emily developed from there," said a source.
As pregnancy rumours surrounded the couple, a spokesperson confirmed the news, saying, "It is true that they are expecting a baby, they are over the moon."
Although the pretty brunette is 17 years his junior, Peter has never seen this as a problem. In fact she was his rock when he lost his brother Andrew to cancer in 2012.
Emily is the eldest of five children and grew up with her brothers in Bridgwater, Somerset. She studied medicine Bristol University, earning her Bachelor of Science in January 2013. This is to be followed by two years of clinical foundation, named F1 and F2.
Explaining their future plans, Peter said: "Let her do her F1, then we'll get married and then we'll have another baby."
The couple currently live near her family in the West Country, but Peter, who spent much of his childhood in Australia, has talked about returning Down Under one day.
The topic came up in an episode of his reality TV show in which Emily appeared. "When the kids are old enough and when I'm older, I'll go because that's also my home," said the star.
When he broached the subject, asking Emily if she would move to Australia with him in 10 years time she agreed immediately.
Excited Peter responded: "That's what makes you special! Do you know what's special about it? It's that you think that far ahead. That's what I love about you. I think it's beautiful."