He's growing up so fast!

Silas Timberlake, the adorable son of Jessica Biel and Justin Timberlake, is turning four this week. And you know what that means—it's time to start the party!

Despite their A-list status, the Hollywood couple has tried to keep Silas' life on the private side. At the same time, they occasionally post photos of their family outings on social media that are enough for pop culture fans to see how cute their family is.

"If that pic doesn't say ‘City Of Love' then I'm out," J.T. captioned his Instagram photo of Silas and Jessica sharing an adorable kiss.

Aside from being the son of two widely successful stars, Silas is also known for his adorably long curly hair and superhero inspired Halloween costumes.  

"This Halloween was one hell of a block party," Jessica said on Instagram after celebrating the spooky holiday. "Happy Halloween from our LEGO family to yours."

There is no word yet on how the famous trio plans to celebrate the big occasion, but with Timberlake finishing up his tour in support of Man of the Woods, maybe it will be a destination party?

Until we find out, check out our galley below to see how much Silas as grown up!

Jessica Biel, Instagram

Justin Timberlake, Silas Timberlake

Instagram

Justin Timberlake, Baby Son Silas, Christmas 2015

Instagram

Jessica Biel, Son Silas Timberlake

Instagram

Justin Timberlake, Silas

Instagram

Justin Timberlake, Baby Silas, Jessica Biel

Twitter

Justin Timberlake, Baby Silas, Jessica Biel

Twitter

Silas Timberlake

Instagram

Justin Timberlake, Son, Silas, Workout, Push-Up, Post-Thanksgiving, 2017

Instagram

Justin Timberlake, Man of the Woods, Album, Music, Jessica Biel, Silas

YouTube

Justin Timberlake, Son, Silas, Father's Day 2018

Instagram

Silas Timberlake

Instagram

Silas Timberlake

Instagram

Justin Timberlake, Jessica Biel, Silas Timberlake

Instagram

Justin Timberlake, Jessica Biel, Silas Timberlake

Instagram

Happy birthday, Silas. Enjoy your birthday week! 

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