Today, Nov. 20, Rihanna released her much-ballyhooed seventh album, Unapologetic. Featuring the No. 1 hit "Diamonds" and guests like Chris Brown, Eminem and David Guetta, the album is picking up major critical praise. Despite the album's title, there's one person she may have to apologize to: Taylor Swift. Unapologetic will most likely knock Swift's Red out of the No. 1 slot on the Billboard 200.