Sources say that Rihanna is checking into a drug rehab. According to Sandrarose.com, the superstar's record label went into damage control after photos of the singer smoking weed surfaced online. She even tweeted about it while vacationing in Hawaii on Sunday. She wrote, "Kush rolled, glass full...I prefer the better things!" The site reached out to Def Jam and a source said, "Every effort is being made to get [Rihanna] into rehab. Even if it's on an outpatient basis." Last year, reports said doctors order Rihanna to stop smoking and drinking.