'Grey's Anatomy' has moved on without Katherine Heigl and she has moved on too ... to another hair color.

The 31-year-old star appeared at a press conference for the Jason Debus Heigl Foundation this week sporting tresses that were not just blonde, but ones that tipped the scales towards a much lighter, platinum version.

Heigl has certainly not been shy about switching up her 'do over the years, reverting all the way from blonde to brunette and back again several times over. And even though this Hollywood mom graces the October cover of InStyle with her new lighter locks, yesterday was her first public debut.

As much as we think this actress is a definite beauty, our friends at StyleList breathed a collective sigh of relief that she ditched the big brown bouffant hairdo she was sporting for her last movie release.