Oscar winner with four #1 Billboard hits (4)

I believe the answer is:

cher

(Other definitions for cher that I've seen before include "US pop singer" , "US singer/actress - French river/department" , "Sonny and - -" , "Moonstruck star" , "1987 Best Actress Oscar winner for "Moonstruck"" .)

I've seen this clue in The Wall Street Journal.

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