The 37-year-old actress, who announced her pregnancy in June, was more than happy to show off her burgeoning belly as she walked the red carpet for CBS, CW, and Showtime's Summer TCA Party in West Hollywood, California, on Wednesday.
"Had the most wonderful day talking about my new show @doubtcbs. Can't wait for you all to see it!" she wrote, along with the cute black-and-white snap. "Thank you to my amazing man @joshbkelley for coming with me and showering me with love and support!"
While this is her first pregnancy, Heigl is already mom to daughters Naleigh, 7, and Adalaide, 4, who couldn't be more thrilled to have a baby brother.
"They're so excited," the Doubt star told ET's Leanne Aguilera on Wednesday. "For them, it's an 'out of sight, out of mind' thing. They'll forget about it for a while, and then suddenly be like, 'Hey, have you had that baby yet?'"
And the same goes for her husband, who is definitely ready for a little testosterone in the house!
"Josh is hugely ready [to have a boy]," she shared. "He's just surrounded by women! It's me, the two girls, my niece Madison often lives with us in Utah… and then my mom."