Patrick Schwarzenegger couldn't wait to tell his family that he was headed to Thailand to shoot Season 3 of "The White Lotus" ...

Maria Shriver reacted to her son Patrick Schwarzenegger's full-frontal nude scenes in the latest season of 'The White Lotus' ...

"You're pregnant," Shriver says to the person behind the camera ... but my family kept noticing me acting weird. Maria thought Abby and I were pregnant," he said, adding a crying laughing emoji.

Patrick Schwarzenegger inspired a theory from his mom Maria Shriver ... explain the off behavior, Shriver and Schwarzenegger’s sister Katherine “thought we were pregnant.” ...

The actor shared a touching video of the moment he announced the news to his sister Katherine Schwarzenegger and his mother Maria ... Shriver had assumed his fiancée, Abby Champion, was pregnant.