And, in the first shots of 10-month-old Cristiano, the resemblance between the father and son is uncanny.
With a head of downy black hair and olive skin, little Cristiano looked adorable as he was carried by his proud father.
The baby also appeared to have taken after his father in terms of his love of designer fashion, as he was wearing a Burberry checked shirt, denim jacket and matching Burberry baseball cap - which he wore backwards to make it more trendy.
Like father, like son: Cristiano Ronaldo has been pictured for the first time out with his son Cristiano Ronaldo Jr
Cute: The 10-month-old baby was the spitting image of his football superstar father, in his Burberry shirt and matching denim baseball cap, which he wore backwards
And it seems Russian model Irina has adapted well to the family style of life, as she was seen cuddling up to her boyfriend's super-cute son in the back of the car.
Irina has remained loyal to Ronaldo despite the revelation last year that he had become a father. The baby was allegedly born to a 20-year-old British student following a fling with the star after they met in a London club.
Chic: Ronaldo's girlfriend Irina Shayk joined the football on the day out in Portugal, and looked stylish in a pair of tight grey trousers teamed with a black vest top and white blazer jacket
My turn for a cuddle: Irina keeps a tight grip of Cristiano as they head home, with Ronaldo keeping a protective eye over the pair
The winger said from the start that the child would be under his 'exclusive guardianship'. But his mother Dolores is helping to raise the child.
After announcing the birth on Facebook, Ronaldo wrote: 'It is with great joy and emotion that I inform I have recently become father to a baby boy.
Cuddling up: Irina and Ronaldo were seen enjoying a romantic day out in Portugal over the weekend
What a good looking pair! The Russian model has remained loyal to Ronaldo despite him becoming a father
And while Ronaldo's mother Dolores is essentially raising the baby between Madrid and Portugal due to the football star's career commitments, Ronaldo spoke recently about how his life had been affected by becoming a father.
Taking in the scenery: The pair enjoyed the sights and sounds in Ronaldo's home country
'Maybe I feel more comfortable. I'm comfortable when things are going well: my family, the club, my friends, that gives me important support for everything else.
'Of course I change the nappies. It's not the thing I like best in the world, but I do it.'