Katie took to Twitter to congratulate Pete and Emily on their good news, writing: "Genuine congratulations to Pete and Emily and I hope they are very happy – kids excited xxx"
A source told The Sun: “Peter and Emily are over the moon. They absolutely adore each other, so having a baby together feels completely natural.
“As far as they are concerned they are going to spend the rest of their lives together and will definitely get married in the next year or so."
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Peter Andre appeared to hint at his girlfriend's pregnancy at an event last month
Pete and Emily met through her father, who is a doctor, after he operated on the 'I'm A Celebrity' star in 2010.
Congrats to them both!
Pregnant Celebs
Pregnant Celebs(01 of08)
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Who's the mumma? Kim KardashianWho's the daddy? Kanye WestBaby ETA: Next yearInteresting fact: Kim's difficulty conceiving the couple's second child was chronicled in 'Keeping Up With The Kardashians', before confirming she was pregnant with a son. (credit:Jason Merritt via Getty Images)
Pregnant Celebs(02 of08)
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Who's the mumma? Coleen RooneyWho's the daddy? Wayne Rooney. Maybe you've heard of him.Baby ETA: JanuaryInteresting fact: This will be the third child for the happy couple. (credit:Shirlaine Forrest via Getty Images)
Pregnant Celebs(03 of08)
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Who's the mumma? Sam FaiersWho's the daddy?Baby ETA: Early 2016Interesting fact: Sam confirmed her baby news on Instagram. (credit:Tim P. Whitby via Getty Images)
Pregnant Celebs(04 of08)
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Who's the mumma? Keira KnightleyWho's the daddy? James RightonBaby ETA: Spring 2015Interesting fact: Keira and James tied the knot in May 2013. This will be their first baby. (credit:Steve Granitz via Getty Images)
Pregnant Celebs(05 of08)
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Who's the mumma? Katherine JenkinsWho's the daddy? Andrew LevitasBaby ETA: Late 2015Interesting fact: The couple shared their baby joy with an adorable snap on Instagram of a pair of pink shoes. (credit:Steve Thorne via Getty Images)
Pregnant Celebs(06 of08)
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Who's the mumma? Olivia ColmanWho's the daddy? Ed SinclairBaby ETA: Summer 2015Interesting fact: The 'Broadchurch' actress has two children already with her writer husband, Ed. (credit:David M. Benett via Getty Images)
Pregnant Celebs(07 of08)
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Who's the mumma? Katie HalilWho's the daddy? Howard DonaldBaby ETA: Early 2016Interesting fact: This will be the first couple for the couple, who married secretly earlier this year. (credit:Bauer-Griffin via Getty Images)
Pregnant Celebs(08 of08)
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Who's the mumma? Kelly ClarksonWho's the daddy? Brendan BlackstockBaby ETA: Early 2016Interesting fact: Kelly confirmed her baby news in a typically Kelly Clarkson-esque fashion, by claiming she was "totally pregnant" during a live show. (credit:Bruce Glikas via Getty Images)