The 36-year-old actress welcomed a baby boy with her husband, Taylor Goldsmith, announcing the news on Instagram Tuesday.
"Gus is here 💙💙💙💙," she wrote. "Our sweet boy, August Harrison Goldsmith. He was punctual and arrived right on his due date, much to the delight of his parents. We were prepared to fall in love in all sorts of brand new ways, but it goes beyond anything we could have ever imagined. M + T."