Idris Elba has welcomed a baby boy named Winston.
 
The actor tweeted Friday that his son was born 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.