Tom Ince and Joe Ledley were both on target for The Eagles this afternoon.
Tony Pulis has sent West Brom into the relegation places as his side put in an excellent performance today.
And it was the deadline day buys who did the bulk of the damage.
Thomas Ince gave them the lead with a cute finish, and then he turned provider for fellow newbie Joe Ledley - who scored from an excellent corner kick.
Julian Speroni made a great save - before Palace finished the game off.
Marouane Chamakh was brought down by Ben Foster in the penalty area - before the Moroccan dusted himself off and tucked away the third for a 3-1 victory.