Hoda Kotb is sporting a new 'do! The 57-year-old host debuted darker brunette hair on Tuesday's show, a big change from her previous light-colored locks.Although her hair looked fabulous, Kotb told her guest co-host on , Sheinelle Jones, that the color was actually a «happy accident.» The TV veteran had been preparing to see her entire family for the holidays and decided to do a keratin treatment — a semi-permanent hair smoothing method — but after three hours of the treatment, her hair was