While walking the blue, water-themed carpet before the screening, Momoa was handed a can of Guinness to quench his thirst.
The Hawaiian native has previously told the Daily Telegraph that his favourite thing about Australia is "mostly the grog" after spending several months on the Gold Coast while he filmed the action movie.
So, we asked the hunk which Aussie beer he thought was the best - and his answer surprised us!
"They have this one called Fixation here," Momoa told Who on the blue carpet.
"Stone and Wood's good too!" he continued.
For those who don't know, Fixation is an Australian IPA brew - fancy!
We also asked the Game of Thrones star what his plans were for Christmas.
"I'll be spending it with my family," he said, before saying he wished he had more time to check out the surf at Sydney's Maroubra beach while he's in town.
The doting dad wouldn't hint what he's got son Nakoa-Wolf, 10, and daughter Lola, 11, for Christmas, but said "it'd be weird if I did tell you what it was!"
We wonder what it could be?!
Aquaman hits Australian theatres on Dec. 26.