The Aquaman star, 44, who shares two children with ex-wife Lisa Bonet, 56, looked smitten as he embraced Adria, 32, at the dinner table and posed up with her during his trip.
He wrote: 'Japan, you are a dream come true you blew my mind. we’re so thankful for everyone who opened their homes, making memories with new friends and old friends, sharing another amazing adventure with mi amor.
'ON THE ROAM motorcycles and mayhem. All my aloha.'
The star recently revealed he was in a relationship during an appearance at the 2024 Basingstoke Comic Con - where he was asked: 'Are you currently single?' with the star responding: 'I’m very much in a relationship.
'You’ll find out very soon. I’ve been in a relationship for a while.'
Adria married her longtime boyfriend, Puerto Rican-American lawyer Edgardo Canales in 2019.
Momoa was previously in an on-off romance with Eiza Gonzalez, 34, who bears a striking resemblance to Adria.
She is known for roles in Emerald City (2017), Anathema Device in the TV adaptation of Good Omens (2019), and Bix Caleen in Andor (2022).
She starred alongside Glen Powell in 2023 film Hit Man, playing his love interest Maddy Masters.
In January 2024 Jason and Lisa settled their divorce, including custody of their two teenage children and how they're dividing their assets.
In new court documents, obtained by The Blast, the former couple agreed to joint physical and legal custody of their daughter Lola, 16, and son, Nakoa-Wolf, 15.
The paperwork read: 'Based upon the division of assets and income as agreed by the parties in the (settlement), the parties shall share the living expenses of the minor children, and neither party shall pay child support to the other.'
