Cristiano Ronaldo is teaching his 4-year-old son his famous 'SIUUUU' celebration, and the footage is adorable

• Cristiano Ronaldo is already teaching his 4-year-old son his famous "SIUUUU" celebration.
• The Manchester United star shared adorable footage of him and Mateo practicing the chant on Instagram.

Cristiano Ronaldo's youngest son, Mateo, may only be four years old, but he's already learning the ways of his father.

In adorable footage shared by the Manchester United star to Instagram on Thursday, Ronaldo could be seen laughing as he tried to get Mateo to mimic his famous goal celebration.

When the 36-year-old scores a goal, he often jumps in the air and lands with his hands down by his sides as he screams "SIUUUU."

The 36-year-old giggled as Mateo gave his best effort to copy the noise.

Ronaldo and his partner, Georgina Rodriguez, announced last month that they are expecting twins.

The couple already share one child, Alana Martina, together, while Ronaldo has three other children.

On top of his first son Cristiano Jr. who was born in 2010, the Portugal captain fathered twins via a surrogate mother in the United States in 2017.

According to Spanish magazine Hola!, Rodriguez is already three-and-a-half months pregnant.

"Delighted to announce we are expecting twins," Ronaldo wrote on Instagram in late-October alongside a photo of he and Rodriguez cuddling in bed.

"Our hearts are full of love - we can't wait to meet you."

The clip was one of two wholesome moments from Ronaldo on Thursday. After playing for Portugal against Ireland in a World Cup qualifier on Thursday evening, the star was seen hugging a little girl who had run onto the field in Dublin. He then gave the child his match jersey.