VIDEO : Lifetime's Britney Spears Biopic Casts Justin Timberlake, Jenna Dewan-Tatum

The cast of characters in the upcoming Britney Spears biopic have reportedly been cast for the upcoming Lifetime film. Production on the movie is underway with Lifetime targeting a 2017 premiere date. The two-hour movie will follow Spears' relationship with Timberlake and how the divorce of her parents and tabloid breakup affected her. And then there's the quickie wedding she had to childhood friend Alexander and relationship with Federline, public breakdown and return to the spotlight. Lot to cover in two hours. How does Dewan-Tatum factor in? She was a back-up dancer for *NSYNC at the time Spears and Timberlake were together.
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