John Stamos and his pregnant fiancée Caitlin McHugh were all smiles on Wednesday as they arrived at Los Angeles International Airport.

Both kept it casual — Stamos, 54, in a loose-fitting blue button-down, gray pants and white Adidas kicks. He added aviator sunglasses, a skull snapback and a black backpack.

McHugh’s growing baby bump peaked out in an oversized green turtleneck sweater. The 31-year-old brunette paired it with black leggings and knee-high brown boots. She accessorized with a brown hat, glasses, and a dark knapsack.

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Until meeting McHugh, Stamos had long reigned as one of Hollywood’s most eligible bachelors. But the preternaturally youthful actor told PEOPLE in the Dec. 25 issue’s cover story that he long felt as though something was missing.

“I always wanted to be a dad,” the Fuller House star said of becoming a father for the first time. “I have a youthful thing. People say, ‘Oh, you look young.’ You start believing you’re gonna live to be 150.”

“And then you wake up and go, ‘No, man, this is it. This is not a rehearsal,’ ” he added. “People would say, ‘You should have a child.’ I was like, ‘That ship has sailed.’ ”

It helped that he and McHugh “talked about” having a baby in the past — and that everything eventually just fell into place.

“We have the same morals and the same values, that all clicked nicely. So we said, ‘Oh, well, maybe we should have a family,’ ” said Stamos, who proposed to the model and actress on Oct. 22 at Disneyland (one of her favorite places) after two years of dating.

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“The look on John’s face when I told him we were pregnant was priceless,” McHugh added. “It was the look of a man who has wanted a family of his own but wasn’t sure it was going to happen for him. Now it is!”