Spanish movie siren Penelope Cruz is cheering on the Houston Astros in baseball's World Series after boyfriend Matthew Mcconaughey, an avid fan, gave her a crash course in the sport's rules.

Cruz was unable to join her beau for the Astros' home games against the Chicago White Sox, but the actor is convinced she was cheering for his team in Hollywood, where she's shooting a new movie.

He says, "We had pillows all the way across the backyard for first base, second base, third base and home, we set up scenarios and reenacted what was happening on screen, got it down and she's starting to dig it now 'cos she understands what's going on."