In her first major event since Heath Ledger's death, Williams turns out at the Cannes Film Festival. Plus: Cameron Diaz, Denise Richards, David Cook and more

HAIR BE GONE!

Cameron Diaz reveals a striking new look – a bald cap! – while filming a scene Wednesday for My Sister's Keeper on the Santa Monica Pier. In the film, Diaz plays a mother who shaves her head in solidarity with her daughter who has leukemia.

Talk about Cameron's new look on StyleWatch