Celebuzz Celebrates with Kourtney Kardashian in Mexico! (PHOTOS)
Kim posted the pics on her blog, saying:
"We had a Mariachi band come to play to surprise Kourtney for her birthday! I am sure it’s not really a surprise, since we do it every year for her, but we had so much fun!!!"Catch the sisters back in action when season six of Keeping up with the Kardashians returns June 12 on E!