Are you talking about those pictures? Because it’s them arriving, and I can’t think about anything of them leaving Kimmel.
There are Getty photos of them leaving separately from Kimmel, and the premiere was immediately after the Kimmel taping. But, yes, they did go to SDCC together. I think they go separately to/from official promotional events because 20th Cen Fox provides them both with transportation.
Just Holding Hands 