Madonna's daughter Lourdes Leon has said the 'most important thing' she carries around her designer purse is her nail glue.The model needs it in case a nail falls off during a night of partying, she told Interview magazine. 'This is arguably the most important thing in my bag. This is nail glue. Because, if you use your hands a lot like me, sometimes that s*** just pops off and it's embarrassing, walking around with nine claws but missing my pointer finger.