I would totally let my roots grow out if I didn't have grays to cover at the same time :P

I really like the honey blondes! It's funny--for all my life it's seemed like a woman would rather die than have dark roots. A cool new trend!

Haha, my hair is pretty much like this right now! All I had to do is grow my dyed hair out! Free fashion is the best :)

My vote goes to the only non-celeb here, Kate! It looks gorgeous and natural.

I absolutely love Drew Barrymore's colour!

I agree with Ali, it's definitely not a good look if your roots are really dark and the ends too light like with Rachel Bilson. Out of all these pictures, Kate's hair is the best looking one.

I like it on Kristen Stewart because it looks funky. Otherwise, the difference has to be subtle.

I like this best when it looks natural and there isn't a harsh difference between the roots and the rest of the hair. The ones at the very top and very bottom look great but I think the ones in the middle are far less flattering.