Adrian Grenier, Hayden Panettiere Adrian Grenier, Hayden Panettiere

Hayden Panettiere and Adrian Grenier have said bye-bye to their long locks, debuting short new 'dos.

Check out photos of Panettiere

Panettiere, who recently dyed her hair auburn, went back to blond but with a much shorter cut. The 20-year-old Heroes starlet debuted her new look slicked back at an Earth Day gathering in Los Angeles.

Entourage star Grenier, 33, also went under the scissors to cut off his mop of perfect curls to show off a short boyish 'do.

What do you think of their new hairstyles?