MELBOURNE, AUSTRALIA - NOVEMBER 06: Mischa Barton poses at the Emirates marquee at the Melbourne Cup at Flemington Racecourse on November 6, 2012 in Melbourne, Australia. (Photo by Don Arnold/WireImage)
What Were They Thinking?!
This week's worst-dressed crew includes Mischa Barton, Beyonce, and Britney. -- By Matt Whitfield, Yahoo! Staff