From typicallyspanish.com

Spain Culture News
Penélope Cruz dubs a lesbian love scene to promote new video from her brother
By h.b.
Dec 24, 2007 - 9:08 AM

Penélope Cruz has taken part in a musical video with her sister Mónica, to help promote the latest video from their brother Eduardo Cruz, ‘Cosas que contar’. Penélope and Mónica are dubbing a lesbian love scene into Spanish in the clip and much is being made of a kiss between the two sisters.

Eduardo is obviously grateful for the promotion for the record which will come from such scenes featuring his sisters, and has commented that it was a dream come true seeing the two girls dancing together.
Penélope has commented that the song means a lot to her and that the melody is very special as it reminds her always of the day that the song was composed in Madrid.