The former couple reportedly decided not to attend the event so as to not run into each other and face a possibly awkward reunion.
The movie won awards for best romance and best sci-fi/fantasy film. Stewart won two awards for her performance while Taylor Lautner and Pattinson won one award each.
"Robsten" ended their thee-year relationship for the second time May 19, about a year after Stewart was photographed cheating on Pattinson with "Snow White and the Huntsman" director Rupert Sanders.
The two began dating while filming the first installment of the Twilight saga.
Celebrity Couples of 2014 [PHOTOS]