Bruce Willis and his girlfriend Emma Heming walking back to their new convertible Bentley after shopping at a grocery store in Bel Air, Los Angeles, California - 02.12.08

The Die Hard star, who turns 54 on Thursday (19Mar09), and the model will exchange vows in Turks & Caicos, where the actor owns a home - according to People.com.

Willis and Heming, 32, arrived on the island at the weekend (14Mar09), and reports suggest they've rented a block of ocean-view homes for guests.

The actor's representatives are refusing to comment.

Source: WENN