It was revealed last month that Nathan Keyes will play Justin Timberlake, and and ET can now confirm that Zac Vran (JC Chasez), Matt Visser (Joey Fatone), Connor Paton (Lance Bass), and Frankie Cena (Chris Kirkpatrick) will also join the cast.
As for Spears herself, she'll be played by Hail, Caesar's Natasha Barrett.
For those that need a pop music history lesson, Spears and Timberlake were both on the Mickey Mouse Club and later dated while Timberlake was in the boy band. When the two split up, it was alleged that Spears had cheated on him, leading J.T. to pen the song, "Cry Me a River."
But these pics of the onscreen *NSYNC is just the beginning. Also cast in the biopic are Clayton Chitty as Spears’ ex-husband Kevin Federline, Nicole Oliver as her mother Lynne Spears, Matthew Harrison as her father Jamie Spears, Tamara Thorsen as Jenna Dewan (who was once linked to Timberlake), Peter Benson as longtime manager Larry Rudolph, Markian Tarasiuk as choreographer Wade Robson, and Kelly McCabe as Jason Alexander, Spears’ childhood friend to whom she was married to for 55 hours in 2004.
Britney plans to span the pop princess' career and follow her rise to stardom, fall from grace and return to the spotlight. Production for the two-hour TV movie started in Vancouver last month and will premiere some time next year.
Spears herself, however, doesn't seem too thrilled with the movie. The singer's rep told ET, "Britney Spears will not be contributing in any way, shape or form to the Lifetime biopic nor does it have her blessing."