America Ferrera has just become a mother. The actress announced on Instagram that her first child, a little boy, has been born.

Welcome To The Family

The Golden Globe-winner shared the happy news on social media on Tuesday. The baby is her first child with husband Ryan Piers Williams.

In the post, the Sisterhood of the Traveling Pants star revealed the little guy's name, as well as his all-important nickname.

"When 2 become 3... Welcome Sebastian Piers Williams -- aka Baz!" she wrote, alongside an adorable photo of the baby's little foot.

Ferrera signed off the post by gushing that she, Piers Williams, and their new little bundle of joy are all doing great and are completely in love with each other.

Sharing The Love

The happy couple shared the news that they were expecting during the New Year. Donning colorful 2018 glasses, and brandishing a teeny onesie, the Superstore actress and her hubby of almost seven years posted a romantic snap on Instagram.

The caption revealed they'd soon have one more face to kiss later this year. Little Sebastian arrived right on schedule, just a few weeks from his parents' wedding anniversary on June 27.

The happy couple, who have been sweethearts since they met in college at the University of Southern California, got hitched back in 2011, in Chappaqua, New York. Piers Williams cast Ferrera in one of his student films, and the rest is history.

Celebrating With Her Sisterhood

Ferrera's baby boy has officially turned the Sisterhood of the Traveling Pants cast into a sisterhood of moms as all four leads -- Ferrera, Amber Tamblyn, Blake Lively, and Alexis Bledel -- are now mothers.

They all posed with her in a photo shortly after Ferrera announced her pregnancy, to share in the good news.

Tamblyn was present at Ferrera's baby shower last month, which she celebrated with her so-called "village of women." The 33-year-old celebrated her big news at Beauty & Essex Los Angeles with guests including Ugly Betty co-stars Ana Ortiz and Mark Indelicato.

She was quick to note there were no "poopie diaper" games being played on the day, and that it was a mostly classy affair.

Ferrera also posed for a sweet group photo with her Superstore colleagues including Ben Feldman, Kelly Stables, Nichole Bloom, Colton Dunn, Kaliko Kauahi, Nico Santos, and Lauren Ash.

The hit NBC comedy debuted in 2015. It follows a group of hapless employees working at a fictional big-box store in St. Louis, Missouri.