Past performers at the seminar have included Madonna and the Beastie Boys, who went on to sell millions of records.
Celebrities sporting the look included singers, Madonna and Mariah Carey.
The visitor said he'd heard that other candidates included Madonna and Ivan Boesky.
Former residents include Alfred the Great, Madonna and Guy Ritchie.
The director's earlier work includes Madonna's underrated "Who's That Girl?"
The justices did not say whether those words included "Madonna" or "Keg party at my house after the game!"
Other stars who have delved into fashion include Madonna, whose line with her daughter, Lourdes, has been very popular since its debut in 2010.
"Discipline and power," said Pasquale Manocchia, a personal trainer whose clients include Madonna.
Other musicians Nicki would like to work with include Madonna and Lauryn Hill.
Roberts, whose clients have included Madonna and Naomi Campbell, is renowned for his "hardcore" approach to personal training.