It's hard not to be overwhelmed by the countless hair colors that trend on Instagram and Pinterest. While many of us are regularly inspired to switch things up, in Hollywood, there's a strong case for consistency. In fact, most celebrities stay true to their signature look so they can be as recognizable as possible. Just imagine J.Lo, Beyoncé , or Jennifer Aniston without their iconic, highlighted shades of honey brown.Sharon Osbourne is another example. For as long as she's been on T.V. — from the 2002 debut of The Osbournes to her current gig hosting The Talk — she's sported her signature red hair. That is, until now. Osbourne's colorist, Jack Martin , unveiled her dramatic, icy transformation on Instagram, sharing that she's debated going full-on white for a while."Sharon has 100% white hair, and she was coloring her hair once a week dark vibrant red for the past 18 years," Martin wrote. "She explained to me that she wanted to do this transformation a long time ago, but every time she attempts, it ends up a disaster."