It happens all the time. An actor and an actress star in a movie together, they hit it off, some chemistry develops, and before you know it, they're dating. But what if they're brother and sister on-screen?
JONATHAN PHILLIPS / EPA Chris Kelly performed with Chris Smith as Kris Kross in February 2013. Kris Kross star Chris Kelly died of the combined toxic effects of heroin, cocaine, ethanol, hydrocodone and
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