Cat Deeley and Patrick Kielty have welcomed their first child, a baby boy! The couple first announced they were to become parents in September and shared the news of the baby’s arrival on twitter Monday, saying they ‘couldn't be happier'.

Patrick Kielty and Cat DeeleyCat Deeley and Patrick Kielty have welcomed their first child.

‘Beyond delighted to announce the birth of our baby boy last week. All doing well & we couldn't be happier...3 really is the magic number!’ Deeley wrote in a tweet which was later shared by her husband.

The couple also received congratulations from Deeley’s former colleagues Ant and Dec, with the new mum telling the duo, ‘Thank you darling! We are completely in love.... Can't wait for you to meet him xxxxx.’

Deeley and Kielty first revealed they were dating in 2012, having been friends for years. They married in September of the same year, in an intimate ceremony in Rome. Last year Kielty opened up about the lengths he went to to woo Deeley, which included flying 5,000 miles.

More: Cat Deeley Announces First Pregnancy

“Cat was in LA and I was in Northern Ireland, so I texted her to wish her a happy birthday,” Kielty said.  “When she said she was having a birthday lunch at the Beverly Hills Hotel, I said I’d be there. She told me to go to sleep as I was drunk.”

“That was 2am. I got up at 5am, went to Belfast airport for 6am, got the 7.15am flight to Heathrow, landed at 8.30am, took off again at 9.40am and arrived in LA at 1.15pm. I was at the Beverly Hills Hotel by 2.15pm. When I walked in, Cat looked at me and said: “Oh, you’re good!”’ The couple now reside in LA, where they’ll be raising their family.

"We're going to ensure we take the baby back home to visit our families as much as possible but, for now, we're happy here in LA and are excited to bring up our child with an outdoors lifestyle,” Deeley recently told Closer magazine. "They're going to experience the LA sunshine Patrick and I never got to experience.”