London Entertainment/Splash News Online
08/18/2009 at 12:00 PM EDT
hasn't appeared on The Late Show
in nearly three years, but Tuesday she'll deliver one of the show's classic bits: the Top 10 list.
Spears last appeared on David Letterman's show when she made a surprise cameo in November 2006. The singer, who recently finished the European leg of her Circus tour, begins another string of concerts in America on Aug. 20.
– Bob Meadows