Jessica Alba and Cash Warren will soon be welcoming their first son!

The expectant mother revealed that she and her producer hubby are going to be proud parents of a baby boy. The couple, who tied the knot in May 2008, already has two beautiful daughters; Haven Garner, 6, and Honor Marie, 9.

Alba, 36, shared the happy news on Instagram with an incredibly cute gender reveal.

"@cash_warren and I couldn't be more thrilled to announce... #officiallyoutnumbered #babyboy#cantwaittospoilhim #hugsandkissesforlife#soontobemamaofthree," she captioned a Boomerang video of herself and her daughters opening a box that showers them with blue streamers, confetti, and balloons.

The Mechanic: Resurrection star's gender reveal comes three months after she announced her pregnancy on social media. "@cash_warren and I are officially going to be outnumbered #babyonboard #herewegoagain #blessed," she wrote alongside an adorable video of herself and the kids holding up black balloons that read "1, 2, 3."

A source told E! News that the actress has been "feeling amazing during this pregnancy" and is living an uber-healthy lifestyle, which includes a strict diet, hot yoga, spin classes and some cardio, as she nears her due date. "She knows that she will slow down as she gets further along," the source said. "But right now she is trekking along and is very active."

Alba has been sharing pictures and videos of her growing baby bump on social media but if there's anyone who knows how to shed all the pregnancy weight, it's Alba. In April 2013, the actress said she donned a double corset day and night for three months and combined it with a strict diet and exercise to go back to her flawless bikini body after the birth of her second daughter.

The mother-to-be is also an established entrepreneur and founder of The Honest Company, which offers a wide range of eco-friendly baby products. Last October, the company, which started retail operations in 2011, came under fire after The Wall Street Journal found that its laundry detergent contained a toxic chemical despite claiming that it was made using natural ingredients.

Alba was rumored to be pregnant with baby number three in 2012 but the reports were quickly dismissed by the actress' representative.