It's that time again. That weekend when when Hollywood pats itself on the back for three-to-four often excruciating hours while the rest of us nestle into our couches, munch popcorn and sit in judgment on stars as they parade across the red carpet. And while most are focused on this year's big change (the expansion of the Best Picture category to 10 contenders), we'd rather weigh in on Oscar red carpet moments from years past. Relive some of the best and worst pop star decisions from Oscars gone by—and we're not just talking fashion (ahem, J.Lo and Ben Affleck). Check out our favorite triumphs and disasters from the Academy's red carpets of yore.