The TV presenter looked happy to be out with his new family following the birth of his daughter earlier this month.
The ITV host, who turned 43 today, was dressed casually in jeans and jumper, with a puffer vest on to keep him warm.
He proudly pushed their stylish pram carrying the couple's precious cargo, as his wife Ali, 40, walked beside him.
At one point Dec could be seen chatting away happily to a woman who looked like she was asking about their new baby, as she peered inside the pushchair.
The proud couple welcomed their first child on September 1.
At the time the presenter broke the news on social media where he revealed he was "head over heels" and that his wife was "doing well".
He told fans: "Ali and I are thrilled to announce the arrival of our baby girl, Isla Elizabeth Anne, who was born just after 9 o’clock this morning."
He added: "Mother and daughter both doing well, Dad is head over heels! D x"
The Sun on Sunday revealed the couple were expecting their first child in March of this year.
The pair, who tied the knot in 2015, first broke the news they were having a child to close friends and family until they were over the safety period of pregnancy.
Meanwhile, earlier today his absent comedy partner Ant McPartlin poked fun at best pal Dec, wishing him a happy birthday with a picture of his pal "wearing a dress".
The 42-year-old telly favourite, who is battling alcohol addiction, couldn't resist having some banter with his longtime pal tweeting a funny message much to the delight of fans.
Beside a pic of Dec posing behind a polka dot frock on a stand, Ant wrote: "Happy Birthday from the big one to the little one! ? A."
During the last series of I'm A Celebrity the pair traded hilarious quips about Dec's height, and the latest post suggests they'll probably never stop.
Fans couldn't get enough, writing on Twitter: "This is the best picture I've ever seen. It's being saved to my phone and it's gonna be my phone background. ??.
"OMG so cute ? Happy birthday Dec ?❤.
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