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Rihanna's "Only Girl" is the singers fourth single to ascended to No. 1 in 2010, making her the first female, and first artist overall since Usher in 2004, to hit the top that many times in a single calendar year. Rihanna also moves to the forefront for most No. 1s in the millennium (since 2000), as "Only Girl" is her ninth track to lead the list. She had been tied with Usher for the past two weeks, with eight chart-toppers since 2000.