While Britney was busy passing out, Usher was being responsible.

The R&B superstar knew exactly what to say during a New Year's Eve party in Tao in Las Vegas -- right when his buddy Jamie Foxx tried to peer pressure him into taking a shot of booze on stage.

Though Jamie had no problem shooting his back (while fisting a bottle of Dom in the other hand), Usher politely declined and passed his off to the hottie standing to his left.