expe kendall made sure to show lots of skin. in fact we had to sensor that bra top. >> look at kendall's cute outfit. the sisters followed rule number two. no matter what show up. at 9:45, khloe and kourtney with a plunging jump suit that barely holds it together. kourtney was under the weather and khloe nursing a leg injury. >> he may have helped with rule number three. trying to avoid your ex. with former man john mayer showed up at midnight but no indication they interacted and yolanda hadid's ex was there too. but how about rule number four. respect your date. >> she left around 1:00 a.m. with lenny kravitz. >> he's out the door. >> zayn malik came late. and he helped with rule number five. when it's your party always leave last. he carried the birthday girl out at 2:00 a.m. >> that's called partying like a rock star and back to taylor that looked like a rock star in that outfit. in about ten minutes we'll explore the style evolution from country cutie to style icon. >> more news about prince's death and the battle over his e