Sandbox Session! Jessica Biel & Rarely-Seen Son Silas Spotted At The Park Before His Big Birthday Bash

In a rare sighting, the 34-year-old was spotted on April 5, rocking a causal girl-next-door look as she took her baby boy to have some fun in the sun at Coldwater Park in Beverly Hills.  

Little Silas dug around in the sand, as his doting mommy kneeled down by his side.  

The 7th Heaven actress and husband Justin Timberlake, 35, waited until the singer's 34th birthday to share the happy news that they were expecting!  

Alongside a dealing picture that showed the proud daddy-to-be kissing his baby mama's growing baby bump, was the caption: “This year, I’m getting the GREATEST GIFT EVER. CAN’T WAIT.#BoyOrGirl #YouNeverKnow#WeDontEvenKnow#WeAreTakingBets.”  

The adorable tot will turn one on April 11.