Extras casting is underway for the fourth "Pirates Of The Caribbean" movie - but women with fake breasts needn't apply. 

Real boobs is one of the stipulations for females who want to get close to Johnny Depp on the film set, as well as the fact women should be aged between 18 and 25 and no bigger than a size six or smaller than a size four, according to TV show "Access Hollywood."

Penelope Cruz will play Depp's love interest in the movie, according to producer Jerry Bruckheimer.
 
The Spanish actress has signed up to play the daughter of British actor Ian McShane's Blackbeard character in "Pirates of the Caribbean: On Stranger Tides."