Idris Elba Welcomes Baby Boy

He announced through an adorable pic on Twitter.

APRIL 18, 2014 — -- "The Wire" actor Idris Elba is a father again.

He welcomed a baby boy Thursday with girlfriend Naiyana Garth, he tweeted.

"My Son Winston Elba was born yesterday..Truly Amazing :-)" Elba, 41, posted next to a picture of the baby holding his finger with his tiny little hands.

WATCH: Idris Elba's 'Mandela' Portrayal Getting Oscar Buzz

This is the second child for the "The Mandela: Long Walk to Freedom" actor. His daughter, Isan, was born in 2002 from a previous relationship. Sounds like she's going to be babysitting in the near future.