The couple, who split earlier this year after she admitted having an affair, were on the red carpet for the screening of the film in Los Angeles.
Stewart, 22, wore a nude lace dress with a strapless bodice as she attended the Nokia Theatre for Twilight: Breaking Dawn Part II, with her hair in a vampish style swept over one shoulder.
British star Pattinson – who plays vampire Edward Cullen – donned a green suit for the finale of the hugely successful series, based on the books by Stephenie Meyer.
The pair, who play a married couple on screen, saw their own low-key romance in the spotlight in the summer after Stewart – who plays Bella Swan – was pictured with married film-maker Rupert Sanders.
There was speculation about how the split would affect the publicity machine for the last Twilight instalment, but they seem to have patched up their relationship – at least for the cameras.