Salma Hayek, who recently announced that she is pregnant and engaged, sliped out the back door of Yves St Laurent on Rodeo Drive in Beverly Hills with a police escort. The popular actress (who is also the producer of the hit series Ugly Betty) was shopping at the store with her mother and attracted such a huge crowd of onlookers that she had the police escort her out the back door. At one point she looked a little stressed but gave a wave to cameras as she drove away. More pics after the jump