In 10 Things I Hate About You , the character Kat is played by Stiles .
In the story , new student Cameron ( Gordon-Levitt ) is smitten with Bianca ( Oleynik ) and , in order to get around her father 's strict rules on dating , attempts to get bad boy Patrick ( Ledger ) to date Bianca 's ill-tempered sister , Kat ( Oleynik ) .
10 Things I Hate About You