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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for #1 hit for Rihanna:

UMBRELLAPOLICY: Regulation regarding a 2007 #1 Rihanna hit?
DISTURBIA: 2007 Shia LaBeouf thriller or a 2008 #1 hit by Rihanna
SOS: #1 hit for Rihanna