Peter is currently on holiday in Orlando, Florida, with his two eldest children - Junior and Princess - and he has sent Emily a cute message as she celebrates back home in the UK.
Emily and their daughter Amelia had been due to go on the trip too, however they were forced to stay home after advice from the Foreign Office. There is currently a risk of catching the Zika Virus in the State and, as the illness can impair unborn children, pregnant women have been advised to stay away.
Earlier today (16 August), 43-year-old Peter shared a picture of himself and his wife with fans on Instagram. Captioning the shot, he said: "Happy Birthday Emily A. Love u."
Emily, who has turned 27, is currently pregnant with hers and Peter's second child together. The couple announced their happy baby news in March and have been busy preparing for the tot's arrival.
The family have recently snapped up a new £5 million mansion in West Sussex, formerly owned by Hollywood actor Tom Cruise, and Emily has been overseeing the removals while Pete and his kids are abroad.
Meanwhile, Peter recently hinted at a return to reality television. The Australian singer walked away from his fly-on-the-wall series in 2013, but he admitted he would like the show to return for "a year or two".
Watch Peter and Emily's wedding video here: