Hey mama! Pregnant Jessica Alba caresses bump as she celebrates baby shower alongside gal pals Molly Sims and Rachel Zoe

Published: 01:25 GMT, 10 December 2017 | Updated: 13:40 GMT, 10 December 2017

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Jessica Alba and hubby Cash Warren are happily expecting baby number three.

And the actress/entrepreneur celebrated the impending birth of her first son on Saturday with a chic baby shower in Beverly Hills.

There, the Honest Company co-founder, 36, eschewed a pastel party for a polished black tie affair where she sported a stylish empire waist frock with tied-up straps.

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Modern mama! Jessica Alba celebrated the impending birth of her first son on Saturday during a chic soiree in Beverly Hill

Jessica was ever elegant in the tea-length black dress which draped over her now third-trimester belly.

The star accessorized with a glam bowed headband that featured a jeweled clasp and matching pearl bangles around the wrist.

Matching earrings framed her face while the Dark Angel lead carried a silver beaded handbag at her side.

Stacked heels elongated her slim 5foot7 form as Jessica strode into her party with a gentle hand upon her belly.

Sharp as a knife! The Honest Company co-founder eschewed a pastel party for a polished black tie affair where she sported a stylish empire waist frock with tied-up straps

In the bag! The Dark Angel actress framed face with pearl earrings while carrying a silver beaded handbag at her side

Pearl in the oyster! The star accessorized with a glam bowed headband that featured a jeweled clasp and matching pearl bangles around the wrist

The Sin City beauty went for retro glamour with her beauty, sporting flirty winged liner and a nude pout.

The fete was decorated with sparkling silver, mirrors and white florals, also featuring an arch of balloons that read: 'It's a boy!'

She was seen giving a close pal a smooch on the lips as she left her party.

Inside the soiree, Jessica was joined by stars Molly Sims and Rachel Zoe.

Sealed with a kiss! She was seen giving a close pal a smooch on the lips as she left her party

Famous friends! Inside the soiree, Jessica was joined by stars Molly Sims and Rachel Zoe

Flower power! Pal Molly, 44, was understated and elegant in a breezy, dark, floral number

Boys will be boys! The fete was decorated with sparkling silver, mirrors and white florals, also featuring an arch of balloons that read: 'It's a boy!'

Shady lady! The mom-of-three paired to look with a pair of black suede booties with heels, a beige Gucci bag and dark sunglasses

Molly, 44, was understated and elegant in a breezy, dark, floral number.

The mom-of-three paired to look with a pair of black suede booties with heels, a beige Gucci bag and dark sunglasses.

Stylist/designer Rachel Zoe, 46, commanded attention in a double breasted black suit adorned with a necklace of golden coins.

The fashionista carried a simple Chanel bag on her arm while twisting her blonde tresses into soft waves.

Fashion icon: Stylist/designer Rachel Zoe commanded attention in a double breasted black suit adorned with a necklace of golden coins

Phone break! Molly took a call while celebrating friend Jessica's third little one

Let down your hair! The model-turned-actress let her long blonde tresses down in loose curls

Jessica and hubby-of-nine-years Cash Warren announced they were welcoming their first boy back in October, a little more than three months after announcing they were expecting.

The couple are already happy parents to daughters Honor, nine, and Haven, six.

Jessica made her transition for entertainment to business when she founded the natural home products brand Honest Company in 2011.

Today the company is valued around a whopping $1billion, according to Fortune.

Growing family! Jessica and hubby Cash Warren (above in November) announced they were welcoming their first boy back in October, three months after announcing baby news