On a giant yacht in the harbor, the two McLaren drivers showed off the helmets that would bring them luck.

Fernando Alonso and Lewis Hamilton show off their diamond studded helmets, while the model that stands between them wears a diamond necklace.
Photo (c) 2007 Brad Spurgeon licensed to About.com, Inc.
The last time the McLaren drivers wore diamonds in their helmets during the race in Monaco was in 2005, when they finished first and fifth. In 2007, the diamonds again brought the drivers luck - different drivers, though - and they came in first and second.