!function(n){if(!window.cnx){window.cnx={},window.cnx.cmd=[];var t=n.createElement('iframe');t.display='none',t.onload=function(){var n=t.contentWindow.document,c=n.createElement('script');c.src='//cd.connatix.com/connatix.player.js',c.setAttribute('async','1'),c.setAttribute('type','text/javascript'),n.body.appendChild(c)},n.head.appendChild(t)}}(document);(new Image()).src = 'https://capi.connatix.com/tr/si?token=ff7fdddc-5441-4253-abc4-f12a33fad58b';cnx.cmd.push(function(){cnx({"playerId":"ff7fdddc-5441-4253-abc4-f12a33fad58b","mediaId":"2757f9a5-9d3c-4e0f-bcf4-6284bcf6701b"}).render("671f5c43e4b0a55cb4cd9d8c");});Stevie Nicks is recalling the single-most valuable advice she ever gave Katy Perry.The legendary Fleetwood Mac singer recently sat down for an expansive interview with Rolling Stone and discussed politics, death and the internet.One particular tidbit about modern-day pop star rivalries has already t