Congratulations are in order for actress Ashley Tisdale and her boyfriend Christopher French! The High School Musical star is engaged, Us Weekly reports. "Best night of my life," Ashley tweeted on Aug. 8 after Christopher proposed on the 103rd floor of the Empire State Building. "We're on top of the world." According to a source for US Weekly, Christopher had been planning on proposing for a while. The two have been dating since December 2012.