The former Gossip Girl star, 31, confirmed her pregnancy at the premiere for Reynolds' new film Pokémon Pikachu Detective in NYC on Thursday, May 2.
She showed off her growing baby bump in a bright yellow dress at the event. The gender of the baby is yet to be disclosed.
The couple, who became married in 2012, walked down the yellow carpet holding hands. They already share two kids, daughters James, 4, and Inez, 2.
The Deadpool 2 star admitted last month that he is going to be a mess when his daughters go off to college.
He said at the time,
When they decide to go away to college, I’m going to be that guy, ‘That’s so funny, I’m going to NYU, too!’ I’m going to be so needy. I love being around them — it’s the best thing in the world.
The pair celebrated their sixth wedding anniversary in September.
Congratulations Lively and Reynolds. We are eager to watch you welcoming a new bundle of joy to the family.