also: トップ・スター
noun
top star; major celebrity
Often refers specifically to the male lead role in the all-female Takarazuka Revue, but can also mean any top celebrity or star performer.
彼は宝塚のトップスターとして長年活躍した。
He was active for many years as a top star of the Takarazuka Revue.
その俳優は今やハリウッドのトップスターだ。
That actor is now a top star in Hollywood.