The American Horror Story co-stars joined the show's cast on crew at the San Diego convention on Sunday, 12 July to promote the new series of their programme.
They were seated at opposite ends of the panel table.
Julia Roberts' niece Emma and actor Evan called off their engagement in June after three years of dating.
A source told People at the time: "They grew apart. They both had a lot of growing to do and it was better that they do it on their own."
Their relationship made headlines in July 2013 when Emma was arrested in connection with a domestic violence incident. She was released without charge after questioning. A rep later called it a "misfortunate incident and misunderstanding."
Shortly after their split, the creator of American Horror Story, Ryan Murphy, confirmed the ex-couple would still appear together on the show. He told Us Weekly: "[Emma] comes at the end, and she has a great thing with Evan Peters at the end.Emma's going to do a fun thing at the end with Evan. That's all I can say."
Emma's also been working on Scream Queens, a new TV show co-starring Lea Michele.
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