Justin Timberlake Introduces Baby Son Silas

Entertainer Justin Timberlake has introduced his "greatest gift ever" to the world - his one week old son Silas.

The singer posted the first picture of Silas Randall on Instagram, showing the baby cradled in the arms of mum Jessica Biel.

The boy is sporting a Memphis Grizzlies basketball shirt.

The photograph is captioned: "The Timberlakes are ready!!! GO GRIZZ!"

Timberlake is part owner of the Grizzlies.

Timberlake and actress Biel announced the pregnancy in January on the singer's 34th birthday.

"Thank you EVERYONE for the Bday wishes!," he posted on Instagram at the time.

"This year, I'm getting the GREATEST GIFT EVER. CAN'T WAIT."

Biel and Timberlake were married in Italy in 2012 and Silas is their first child.