Here's Jane Seymour in Sinbad & the Eye of the Tiger

Definitely worth checking out Carole Bouquet in For Your Eyes Only. Couldn't find a pic to do the hair justice and unfortunately she's had it cut short since.

Olivia Hussey in Romeo & Juliet.

Sofia Coppola in Godfather III

Helen Slater in Supergirl (not enough blondes featured so far)

And here's a real oldie. Lady Godiva of Coventry starring Maureen O'Hara.