markandsam460newWM.jpgMark photo courtesy MrPaparazzi

Mark Ronson may be rockin' blonde locks now, but back in 2008 while dating Lindsay Lohan, his sister Samantha gave the frosted look a shot.

Samantha's big bro bleached his normally dark 'do while hanging out in Dublin, Ireland.

Which Ronson sibling sports blonde hair best? This one's a toss up.