Jessica Biel and Justin Timberlake's baby, Silas seems to be a bundle of joy, who keeps his mommy and daddy on their toes all the time.

Jessica Biel made her first post-baby appearance on August 27, nearly four months after giving birth to her son, Silas. Just a day after her husband Justin Timberlake, had surprised the fans by showing up at a Taylor Swift Concert.

Baby Silas, too made his Instagram debut just in time for the NBA playoffs. He sported a cute Grizzlies jersey. Later, Jessica Biel and Justin Timberlake gave a glimpse of their newborn on Father's day.

Jessica told E! News that her favorite part of caring for Silas is the moment he wakes up from a nap.

"He's sort of looking around and you kind of creep up and look over the crib and he looks up and he goes [Biel lets out a big sighing sound]," Biel told. She added, "Just a gummy mouth, no teeth, just a big smile, happy that you're alive and you're just looking at him. That's probably the most magical."

Just like all the magical moments, this one too doesn't last too long. The next moment, Biel moves on with a dirty diaper in her palm.

On Thursday night, Biel made her first post-baby public appearance. She stepped out at RonRobinson in Santa Monica to launch the BAREITALL +BARE AW15 accessories collection by designer Garson Ratowsky. Her younger brother, Justin Biel who is the brand's Justin Biel joined her at the event.

The new mama chose a sexy self-portrait jumpsuit finished with a crochet blouse and navy culottes. She toted her look with an eco-friendly handbag from Bare's latest collection.

Apart from the family, Jessica is also pushing hard towards expanding her career. She is working on her movie "Devil in the Deep Blue Sea" and hopes to get it on the floor soon.

This October, Jessica Biel and Justin Timberlake would also be receiving an Inspiration Award from GLESN for their impact on LGBT Youth.