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10. Beyoncé
By the time Beyoncé turned 25 in 2006, she had already released five studio albums with Destiny's Child, and two solo albums. In fact, her second solo album, B'Day, was released in honor of her 25th birthday. 

At that age her relationship with Jay-Z was already well underway. The two began dating in 2002, but did not marry until 2008. It's kind of crazy to realize she was only 21 when she hooked up with the rapper (who is 12 years her senior).