Penelope Spots Dude Hangin' 11

1/4/2007 1:05 PM PST BY TMZ STAFF
Penelope Cruz, followed by her sister Monica, were blindsided on a beach in St. Barths by a man wearing nothing more than a wristwatch.

The sisters did a double take after this nude dude disrupted their seaside stroll. We're told the girls kept their cool just long enough for the ass to pass, and then they broke up laughing.