United Kingdom, April 18 -- Justin Theroux and Nicole Brydon Bloom have welcomed their first child into the world.

The couple announced the arrival of their son - whose name was not revealed - in a sweet joint Instagram post on Saturday (18.04.26).

They shared an adorable black-and-white shot of the newborn lying across the 54-year-old actor's chest, with the caption: "He's here. We are so in love."

Celebrities showered the Beetlejuice, Beetlejuice star and the Paradise actress with congratulatory messages in the post's comments section.

Running Point cast member Brenda Song, 38, penned: "CONGRATS!!! So happy for you guys! (sic)"

Former co-anchor of Saturday Today, Peter Alexander, 49, typed: "Congratulations! We're so thrilled for y...