Justin Timberlake and Jessica Biel welcome baby boy

Justin Timberlake and Jessica Biel. Photo / Getty Images

Jessica Biel has given birth to a baby boy.

The 33-year-old actress and husband Justin Timberlake are "ecstatic" about their new arrival, Silas Randall Timberlake, People magazine reports.

The couple had kept their exciting news a secret until Justin's 34th birthday earlier this year, when he tweeted alongside a photograph of him kissing his wife's belly: "Thank you EVERYONE for the Bday wishes!

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

And Justin couldn't help but gush about the I Now Pronounce You Chuck and Larry actress recently, revealing his excitement about their "greatest creation yet".

He said: "You can't have innovation without creation. I want to thank my best friend, my favourite collaborator, my wife, Jessica, at home, who is watching. Honey, I can't wait to see our greatest creation yet.

"Don't worry, daddy is headed home right now to innovate by learning how to change a poopy diaper and get my swaddle on."

Meanwhile, a source previously claimed Justin incredibly protective of his wife on one of their last night's out together before they gave birth.

An eyewitness said: "Justin protectively stuck by her all night and they were telling a friend how excited they are for the baby. It seemed like they were enjoying their shared secret.

"[He was] watching Jessica with a huge proud smile [and telling friends], 'This is for sure the last time we'll go out before the baby.' Justin seemed beside himself with excitement to be a dad."

- BANG Showbiz