Justin Timberlake and Jessica Biel post first picture of their son

Silas and his mother Jessica Biel posed for father Justin Timberlake. Credit: Instagram/justintimberlake

Justin Timberlake and Jessica Biel have debuted their newborn son in a sweet Instagram post.

Silas Randall Timberlake wears a tiny Memphis Grizzlies basketball shirt - his dad's team - while his mother smiles at the camera.

Timberlake Sr was said to be "ecstatic" when the couple welcomed their son into the world.

Biel and Timberlake went public with their baby news earlier this year when the father-to-be posted a picture on Instagram of him kissing his wife's baby bump with the words, "This year, I'm getting the GREATEST GIFT EVER. CAN'T WAIT."