I almost want to say blonde because as a brunette she looks too much like the little nerdy chic she played in Clueless. Looking at that brunette pic up top I can't just see her hair growing into frizz and those terrible overalls.
love love love Brittany but i like her hair better brown out of those two pictures. but im not sure it might just be the makeup cos i remember thinking she looked hot as hell in the faster kill pussycat video and her hair was blonde then. but yeah from those two pics the brunette looks better