"The Sweet Escape" is a song by American singer Gwen Stefani from her 2006 second solo studio album of the same name. It was written by Stefani, Aliaune "Akon" Thiam and Giorgio Tuinfort, and produced by the latter two. From Wikipedia
Fans watching live at Fontainebleau Las Vegas realized midway through the show that the performances were video segments rather than in-person sets.