The co-stars reveal silly secrets!

THOMAS HADEN CHURCH, SARAH JESSICA PARKER and DENNIS QUAID star in the upcoming comedy, 'Smart People,' and the three giggled about their on-set chemistry -- and Sarah Jessica's secret teenage crush on Dennis! -- with our KEVIN FRAZIER at the Sundance Film Festival.
Sarah gushed about Dennis' 1979 cycling movie, 'Breaking Away,' which she says she saw a whopping 11 times. She also showed off her biceps and told us the new 'Sex and the City' movie will have "stuff with automatic weapons"! Plus, Dennis brings us up to date on his twins. Watch the video for more fun!