Sandra and Ryan became very close when filming 'The Proposal' and we all know Kristen and Rob fell in love after 'Twilight' -- but which is the hottest couple? Sandra Bullock
and Ryan Reynolds
met on the set of The Proposal
. They were married at the time -- but now they are both single and sparking rumors that they are together! Likewise, Robert Pattinson
and Kristen Stewart
were introduced to each other when they starred in Twilight
and have been going strong
for a long time. But they aren't the only ones whose romance blossomed during work -- see seven other couples and vote for the sexiest!