"Dawson's Creek" stars James Van Der Beek and Joshua Jackson reunited in L.A. ... and we're pretty sure they're both vampires -- 'cause neither looks like they've aged a day.
The 37-year-old Beek snapped a pic Saturday night with his 36-year-old former co-star ... reminding people why they were once teen heartthrobs.
No sign of Katie Holmes or Michelle Williams -- but we're guessing Dawson complained about both of them to Pacey ... while comparing his life to some classic movie.
We miss that show. Sue us.