The 'American Horror Story' co-stars, who split in June after three years together, reportedly appeared to be on good terms after enjoying a low-key meal at Izakaya in West Hollywood.
An insider told E! News they were both smiling and seemed to be on friendly terms, as they left the restaurant, but it is not yet known if they have rekindled their relationship.
The 24-year-old actress, who got engaged in December 2013, ended her romance with the 28-year-old actor two months ago after deciding it had "run its course," but they have remained friends.
A source previously said: "They have so many great memories together but couldn't make it work in the end.
"The break-up was amicable, there was no drama whatsoever. Emma and Evan are even still friends!"
Emma recently claimed she had cleared the "toxic" people from her life.
She said: "Since I've turned 24, I really like cleared out toxic people in my life.
"I only surround myself with people, with work and with friends. People that are going to make me feel confident and make me happy and make me laugh. And so that way, the mean things don't get to me as much."