Pretty in pink!
Jessica Biel became a first-time mother in April, when she welcomed son Silas Randall with husband Justin Timberlake.
And the 33-year-old was more than happy to show her support at the Baby2Baby gala in Los Angeles on Saturday.
The organisation provides diapers, clothing and other accessories to low income children.
Jessica was apparently feeling oh-so-retro when she picked out her gown for the star-studded event, and chose a pink prom dress.
The floor-length off-the-shoulder frock had huge, puffy sleeves, ensuring the actress turned heads as she walked the red carpet.
Jessica paired the gown with matching heeled sandals and wore a statement jewelled necklace, while carrying a navy clutch.
The Total Recall star swept her brunette locks into an elegant chignon with a couple of loose tendrils framing her pretty face.
Jessica completed her look with dewy make-up, rosy blusher and matching lipstick.
The actress and her superstar husband Justin celebrated their third wedding anniversary last month.
The happy couple attended the GLSEN Respect Awards together a few days before the occasion, and joked about being new parents.
'Thank you for allowing mommy and daddy to have a really good night out together,' laughed Justin, as he and Jessica took to the stage.
'With adults. Honey, look around, this is what adults look like. They do exist! They don't smell like poopy diapers... some of you do.'
Jessica and Justin started dating in January 2007, and got engaged almost five years later.
Gushing about her husband to People last month, the beautiful brunette said: 'He supports everything that I do and that's why I think he's a wonderful partner.'
read more:one shoulder formal dresses