The Mysterious Girl singer revealed that he thinks his wife Emily MacDonagh will give birth next month, weeks before her December due date. The couple's first child, Amelia, was early.
"There's a date in my diary in November where I will not be more than an hour away from Ems at all times," said Peter, 43.
Emily MacDonagh is due to give birth in December
Speaking to Now magazine about his wife's pregnancy, Peter, who was promoting the npower Super Powers campaign, added: "[Emily] finds it tough at times but she's such a good soul. It's freaking me out – but in a good way."
Emily, 27, has also admitted that she feels she could give birth early.
"I had to go to hospital two weeks ago because I'm having contractions already, which makes me think this baby could come early," she told Reveal.
The couple have a daughter Amelia, who turns two in January
The junior doctor and her husband Pete welcomed their first child Amelia, who they call Millie, in January 2014. The adorable little girl helped play a part in breaking the pregnancy news to her dad.
"Millie and I wrapped up the test and put it in a little bag," said Emily. "When Pete got home I told him we had got him a present. He didn't get it and was just looking at the test. He thought I'd just bought one to do!"
"Pete started crying when I told him I was pregnant. He was really happy."
"[Emily] finds it tough at times but she's such a good soul," said Pete
Emily recently showed off her baby bump in a sweet video that Pete posted on Instagram. The clip showed the pair encouraging pregnant women around the UK to get their free flu vaccination from the NHS, just as Emily has done.
Pete then asks Emily to "show us your bump" as the camera pans down to show the doting mum gently rubbing her tummy.
The pop star has two other children from his previous marriage – a son Junior, 11, and a nine-year-old daughter Princess.