Justin Timberlake and Jessica Biel welcome a baby boy – find out his name!

It's time to welcome a new celebrity baby to the world: Justin Timberlake and Jessica Biel have announced the birth of their first child.

Yes, the couple had a baby boy on Saturday and they're "ecstatic", their reps confirmed to People. So what did they call him? Everyone, meet Silas Randall Timberlake.

Silas is the middle name of Justin's grandfather Bill Bomar, who died in 2012, while Randall is Justin's own middle name and his father's name. Phew, we're glad they didn't go down the usual Hollywood path of bonkers baby names!

Hollywood's hottest new parents: Justin and Jess. Image: Getty.

Justin's mother Lynn Harless congratulated the pair on Facebook.

"My amazing son and his beautiful wife have given us the most precious gift in the world! Silas Randall Timberlake! Named after my father and my son! Life is beautiful and we couldn't be happier! God bless you all and thanks for all the congrats!" she wrote. "My face hurts from smiling so much."

Justin, 34, and Jessica, 33, kept the actress' pregnancy secret for months before revealing their news on Justin's birthday in January.

"Thank you EVERYONE for the Bday wishes! This year, I'm getting the GREATEST GIFT EVER. CAN'T WAIT. #BoyOrGirl #YouNeverKnow #WeDontEvenKnow #WeAreTakingBets," Justin captioned a photo of himself giving Jessica's baby bump a kiss.

Justin also gave an adorable shout-out to Jessica at the iHeartRadio Music Awards on March 29, saying he "can't wait to see our greatest creation yet". Watch the emotional moment below…cry me a river, much?