Rachel Bilson (who'll forever be Summer Roberts in our hearts) turns 32 on August 25, so we figured that makes today as fine a time as any to celebrate the actress' spectacular tresses. Rachel picked up on the ombré hair trend way back in 2010, far earlier than the rest of the style set, and is still rocking subtle dip-dye highlights after all these years.

Whether Rachel's sporting full-on ombré, a blonde-bottomed ponytail or any shade of gradient in between, we always end up taking her photo to our colorist. Below, an homage to the birthday girl's hair:

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Summer lovin':

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