“Welcoming home our new bundle of love. Overwhelmed with gratitude,” she shared on social media.
Dozens of celebrities flocked to Instagram to congratulate Laura and her Hell or High Water actor husband on the safe arrival of their gorgeous son.
The 39-year-old's OITNB co-star Uzo Aduba wished her well, writing on Instagram, "YAAASSSSSSSS!!!!!!!! Happy Happy Birthday. Love you lady!"
Natasha Lyonne also commented with heart-eye emojis while Dwayne Johnson added, "Beautiful!! Congrats."
The couple announced they were expanding their brood in October. Taking to Instagram, Laura showed off her stomach underneath an all-black ensemble while holding the couple's first child on her hip. She captioned the adorable post: "We are so excited to announce that our family is growing. Life is beautiful! #knockedup.”
Laura— who also appeared in the Emily Blunt-led thriller, The Girl On The Train last year— and Ben revealed they were expecting their first child in the summer of 2017. Six months after giving birth to their daughter Ella, Ben, who's also an actor, popped the question. While they never spoke out about their engagement, Laura showed off her diamond ring at a movie premiere.
Laura previously dated Christopher Masterson and was also engaged to Robin Wright. They split in November 2014 and brifely rekindled their romance before breaking up for good in 2016.