PHILTONBLUE031608_01.jpgPHILTONBLUE031608_04.jpgParis Hilton NHilton031608_006.jpg After a week filled with birthday parties, Paris Hilton finally stepped out to do a little shopping for herself!

The celebutante and her boyfriend Benji Madden met up with Paris' sister Nicky and her boyfriend David Katzenberg for a little couples' shopping at Fred Segal yesterday afternoon.

We also caught Benji and David e caught the two heading back to their cars together with their respective girlfriends' purchases. We sure hope these two are getting to be friends - after all, they're gonna be spending a lot of time together in the future!