April 29, 2016 02:00 PM

Alec Baldwin and his wife Hilaria are well on their way to becoming a family of five.

The couple stepped out Thursday to attend the All The President’s Men premiere during the 2016 TCM Classic Film Festival‘s opening night in Los Angeles.

Hilaria, 32, showed off her baby bump in A Pea in the Pod’s Isabella Oliver Sleeveless Ruched Maternity Maxi Dress, completing the look with an understated necklace and relaxed hairstyle. Alec, 58, accompanied his wife in a simple dark suit and button-up shirt.

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Hilaria is due with the couple’s third child — a boy — this September. The new baby will join siblings Carmen Gabriela, 2½, and 10-month-old Rafael Thomas.

Hilaria has taken to Instagram to share not only sweet snaps of her family, but also to promote body positivity and the idea of supporting women in a way that they will feel proud of their pregnant bodies.

“And we begin the journey again!” the yoga instructor captioned one photo. “I posted belly photos every two weeks when I was pregnant with Rafa. I didn’t have the guts to do it the first time around with Carmen. The purpose? To show that we don’t need to be ashamed or hide the pregnant figure.”

And though the Baldwins feel “very lucky” to have their soon-to-be-three children, Alec — who has a daughter, Ireland, 20, from his previous marriage to Kim Basinger — told PEOPLE earlier this month that their family will be complete.

“We had our daughter and we said, ‘How could another one of these be wrong?’ Then we had our son, and we said, ‘How could another one of these be wrong?’ ” the former 30 Rock star, who was announced Thursday as the host of the upcoming new Match Game, said at the time.

“But now we’re thinking, if we had another one, it wouldn’t be wrong, but it would be very stressful. We’re very lucky, we’re very happy.”

— Jen Juneau

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