Lil Wayne definitely had a medical emergency on his private jet -- TWICE -- and he's definitely been hospitalized ... so, why the coverup? We broke the story ... and now we'll tell you why multiple people are saying Weezy suffered 2 seizures in the last 24 hours. Plus, Britney Spears' ex-nanny calls in to blow up Sam Lutfi's meth accusations. Who was really taking drugs in Brit's house, and what kind? Leah Frand tells us what she saw ... and it's a lot different from Lutfi's version.