“Rehab” is about a complicated relationship. While Rihanna loves this person, he treats Rih with scorn. She inexplicably loves him but doesn’t know why. Though Justin Timberlake is featured on the song, he doesn’t contribute much vocally. He is credited as a co-writer though. The song managed to peak at 18 on the Billboard Hot 100, continuing Rihanna’s impressive chart performance from Good Girl Gone Bad.

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