United Kingdom, July 6 -- Milo Ventimiglia and his wife Jarah Mariano have welcomed their second child together.

Jarah, 42, announced the arrival of the couple's newborn son in an Instagram post celebrating what she described as "chaos, but in the best possible way".

This Is Us actor Milo, 49, and Jarah quietly expanded their family after welcoming a baby boy in June, according to TMZ.

Jarah revealed on Instagram the couple's son has been named Rock-Anthony Makoa Ventimiglia.

Her announcement comes after she and Milo revealed earlier this year that they were expecting their second child together.

Sharing the family update on Instagram, Jarah wrote: "These last couple of weeks have been chaos, but in the best possible way. Welcome bac...