Pop superstar Katy Perry has reached another milestone with her "Teenage Dream," as its latest single, "Last Friday Night," reached No. 1 on Billboard's Adult Pop Songs chart.  It's the album's fourth No. 1, making it the first record in the chart's 15 years to take four songs to the top.  The album was very close to having five toppers on the chart, but "E.T." was  narrowly edged out by Adele's "Rolling In the Deep" for four straight weeks.

Two weeks ago, "Last Friday Night" reached No. 1 on the Billboard Hot 100, making it the fifth "Dream" single to top that chart.  The feat has only ever been achieved by Michael Jackson when his 1987 album "Bad" spawned five No. 1s.