Later in the day, Blake changed into a bright yellow Jenny Packham ball gown, which she wore under a Madewell jean jacket.
Although, her favorite part of the outfit appears to be her shoes. The actress proudly showed off her pricey Christian Louboutin heels on Instagram.
And check out her stunning jewelry game.
This isn't the first time pregnant Blake has killed it in the fashion department. Last month, she stole the show at the Cannes Film Festival thanks to more leggy, tight-fitting looks courtesy of Giambattista Valli Haute Couture and Versace.
Last September, Blake explained her glam pregnant style while she was pregnant with her first child, the now 1-year-old James Reynolds -- specifically, why she chose not to sport any maternity wear.
"I thought, 'So much of me has changed -- I can't change the way I dress too!'" she told InStyle. "I actually didn't even buy any maternity clothes at all -- I just wore stretchier things and didn't button my pants and wore sweaters that were long enough so you couldn't tell."
Earlier this month, Blake got candid about being "protective" of her family -- her daughter and her husband, 39-year-old Ryan Reynolds.
"My family: That's the thing that I feel most protective of and the thing that I feel is the most exposed when I feel exploited,” she told Marie Claire. "I'd rather not have to deal with it at all, but we knew the lifestyle we were getting into, and while it's hard… it's another thing when it's our child. She didn't have the opportunity to make a decision about what she wants."