Jessica Biel makes first post-baby appearance, to support her brother

The Timberlakes are out and about! Jessica Biel made her first post-baby appearance on Thursday, just a day after husband Justin Timberlake surprised fans at a Taylor Swift concert.

The “7th Heaven� alum and the ‘N Sync veteran, who wed in Italy in 2012, welcomed their firstborn in April and have kept a low profile since his arrival. The little guy did make his Instagram debut just in time for the NBA playoffs, and the couple gave us another glimpse of him on Father’s Day.

But on Thursday, Biel made her first official public appearance, stepping out in Santa Monica to launch the BAREITALL + BARE AW15 accessories collection with her younger brother Justin Biel, the brand’s communications director.

The actress dressed in a sheer, embroidered blouse and wide-leg trousers and toted one of Bare’s eco-friendly handbags. She told E! News’ Marc Malkin that one of her favorite mom moments is seeing Silas wake up from a nap.

“He’s looking around and you creep up and look over the crib, and he looks up and he goes, ‘sigh,’ � she said. “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.�

The 33-year-old also shared that she’d been backstage when her husband joined Swift onstage at Staples Center on Wednesday.

Timberlake, 34, was one of the “Shake It Off� singer’s many surprise guests during her five sold-out shows. She billed him as her longtime “musical crush,� and he hit the stage to perform a duet of “Mirrors.� The moment was Timberlake’s first time onstage since welcoming Silas.

“I’m just honored that he chose this as his first performance,� Swift said.

Swift’s pal Selena Gomez and “Friends� star Lisa Kudrow also hit the stage on Wednesday.

Follow me on Twitter @NardineSaad.