The proud parents have shared photos of their newborn baby as they marked his first month. Snuggling up to her little tot and planting a sweet Eskimo kiss on his nose, Hilaria wrote "4 weeks #LeonardoÁngel" alongside a heart emoji.
Alec, 58, shared a close-up photo with his followers, who were quick to comment on the beautiful baby boy. "Hilaria's eyes..." wrote one fan, while another posted: "Another beautiful copy of Baldwin so cute."
"4 weeks #LeonardoÁngel," wrote Hilaria
The actor and the yoga instructor have been doting on their baby boy ever since they welcomed him into their family in September. Alec and Hilaria are also the parents to three-year-old Carmen and one-year-old Rafael.
The youngsters have been bonding with their new baby brother. Adorable Carmen has been singing lullabies to Leo, while Rafa has been playing with his new partner in crime.
The baby boy is Hilaria and Alec's third child
Hilaria has written candidly about her experience of being a mum-of-three. She said of her older kids: "They love little Leo, but we have our moments when I see how hard it is for them still. It comes in waves. Carmen told me yesterday that I am only her mummy and I can only hold her. Rafa did the same in his own 15 month babble.
"It is a strange pain that you feel when you disappoint one of your babies because you have to take care of another. Causing sadness and happiness at the same time with the most important little people in your life. I'm realising that no matter how much I give, I will never be enough mummy to go around at this age.
The yoga instructor admitted that her older children find it hard to share their mum's attention
"They are used to love and they are always wanting more. Rightfully so. They should be taken care of and made to feel safe and secure."
She concluded: "I realise that I must also teach how they have to learn the inevitable: to live amongst others (who have needs that may conflict with their own) and that they cannot always be the centre of attention. Hard for us all. I definitely shed some tears yesterday. I hate to disappoint any of them...this whole mummy stuff is tough!!"