Source: Getty / George Pimentel [1]

Idris Elba welcomed his son [2], Winston Elba, with girlfriend Naiyana Garth on Thursday. The actor announced the news by sharing an adorable photo of the newborn's teeny-tiny hand on Twitter and wrote, "My Son Winston Elba was born yesterday. Truly Amazing." Idris is already dad to 11-year-old daughter Isan, with ex-wife Dormowa Sherma. Idris has been dating makeup artist Naiyana since 2013, and he took her with him to this year's Golden Globes, where they hung out with Bradley Cooper and his mom, Gloria Campano [3]. Congratulations to Idris and Naiyana!

My Son Winston Elba was born yesterday..Truly Amazing :-) pic.twitter.com/MrSEQPZo4z [4]

— Idris Elba (@idriselba) April 18, 2014 [5]