File photo shows actor Idris Elba at the Palm Springs International Film Festival Awards Gala.

New York - Idris Elba has welcomed a baby boy named Winston.

The actor tweeted on Friday that his son was born on Thursday, adding a photo of the baby's tiny hand gripping his finger. Elba's girlfriend, Naiyana Garth, gave birth.

It's the second child for the star of Mandela: Long Walk To Freedom.

The 41-year-old Elba also has an 11-year-old daughter from a previous relationship. - Sapa-AP