Kristen Stewart looks genuinely surprised as BFF costar Nikki Reed sneaks up to her from behind at the San Diego Comic Con on Thursday afternoon (July 23).

The duo were joined by cast mates Taylor Lautner, Robert Pattinson, Christian Serratos, Kellan Lutz, Ashley Greene and Rachelle Lefevre at the event.

The whole cast surprised many of their fans by sticking around for “The Twilight Experience,” a one-night-only special theatrical re-release of the film with an introduction and Q&A session with the stars, Thursday night at the Gaslamp Pacifc Theaters.