12/5/2008 2:36 PM PST
The 45-year-old resurfaced at a NYC concert recently, looking smooth.
Richard Marx
Marx's song "Superstar" is about Madonna.

Richard has three children with his wife Cynthia Rhodes, a former actress/dancer who played Patrick Swayze's original "Dirty Dancing" partner (the chick who undergoes a botched abortion) in the 1987 film.