Since first topping the Billboard Hot 100 singles chart in 2006 with "S.O.S.," Rihanna has made a habit of hitting the number one spot with an unmatched string of addictive pop hits. With her latest single, "Diamonds," hitting the top of the Billboard Hot 100 this week, the Barbadian star has an incredible 12 number-one hits under her belt after just seven years in the game. According to Billboard, Rih Rih has now tied Madonna for the fourth most number-ones in the 54-year history of the chart. She now trails just Michael Jackson (13), Mariah Carey (18) and The Beatles (a whopping (20) for the most chart-toppers of all time. And at 24, best believe she isn't finished yet. Here are all 12 of the Billboard Queen's #1's in chronological order. How many more does she have up her sleeve?