Kristen Stewart and Robert Pattinson in April 2011
04/18/2011 at 03:00 PM EDT
and Kristen Stewart
aren't known to show much affection in public.
But on Sunday, after Stewart, 21, joined Pattinson's parents at his Water for Elephants premiere in New York
, the Twilight
duo was caught getting cozy.
Stewart didn't join her British beau, 24, on the red carpet where he posed
with costar Reese Witherspoon
. But she certainly seemed to show her support after the party, as the two shared a smooch – and a smile – in a car before speeding off.
– Dahvi Shira