On the heels of "Aquaman" becoming the highest-grossing DC Comics movie ever, Jason Momoa returned to Iowa — to visit his grandma.

Cue the "Ooooohhhhssss."

"Needed to come home to Iowa and give my grams some aloha," Momoa wrote on Instagram. "Love u forever grandma."

That's right, Momoa might get swole at the gym, but he's a softy at heart.

Momoa's central Iowa tour continued at the Waveland Cafe, where he dined with at least a dozen of his cousins, nieces and nephews.

More:Yes, Aquaman and Superman played high school soccer together in Iowa

The Waveland is a regular haunt for the superhero, who visited last year and ordered "Da Momoa," which features an unholy amount of eggs and bacon.

"Boom," Momoa wrote on Instagram last year. "Getting thick Hawaiian style in Iowa."

This go-around Momoa was mum on his order, but declared that he "finally made it" because he got to sign the wall — which presumably means he put his John Hancock on a portion of drywall where famous and/or super attractive people leave marks in remembrance of their visit.

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Momoa, who grew up in Norwalk, told me during a phone interview in December that he "holds a lot of pride" in being raised with Midwest values.

More:Iowa-raised Jason Momoa gets musical and muscular on his 'Saturday Night Live' debut

"There's a certain humbleness that is unique to the Midwest," he said. "It's a certain belief that if you work hard and do good and don't depend on what's on the outside, but lean on inner beauty for success then you will find it."

On social media, Momoa shows love for the Hawkeye state regularly.

"HAWAII backwards is IIAWAH," Momoa wrote on Instagram.

As a child, Momoa split his time between Iowa, where his mom lived, and Hawaii, where his dad called home.

Momoa was able to channel a lot of those years spent finding meaning and himself in two such different locales into his portrayal of Arthur Curry — the king of Atlantis who is born of both the surface and water worlds.

"I loved where and how I grew up because both places were rooted in family," Momoa said. "They are really very similar, except there's more ocean one spot and more corn in the other."

Ironically, Iowa is where Aquaman first got interested in the science and study of water when he took courses in marine biology at Central Campus.

"I always wanted to do marine biology, and even though Iowa is very landlocked, the Des Moines school system offered me that," he said. "Here we are and my name is associated with water, and that's because of Iowa."

While the Iowan loves coming home, he said he probably won't make his residence in the Hawkeye State. He's a rolling stone who would rather be on the road than in one place, he said.

"And," he added, "visiting is just too much fun."

Jason Momoa's favorite places to visit in Des Moines …