Monica Cruz's Mystery Tattoo

Penelope‘s look-a-like sister (and fellow actress) Monica Cruz walks the pink carpet in a black strapless gown at the 5th Annual Glamour Magazine Beauty Awards 2007 on Tuesday at Pacha Club in Madrid, Spain.

Monica, 30, showed off her mystery right shoulder blade tattoo upon arriving and finished off her look with a black headband. Any takers on what her tattoo means?

10+ pictures of Monica at the Glamour Magazine awards…