Jamie Lynn Spears says her sister Britney Spears was 'so sad' after splitting from Justin Timberlake

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Britney Spears was 'so sad' following her split from Justin Timberlake, according to sister Jamie Lynn Spears.In a sneak peek of Jamie Lynn's upcoming interview with Call Her Daddy obtained by People, Jamie said she still 'cries' remembering how heartbroken her sister was over the ordeal.'I think everyone thought it was forever,' Jamie Lynn, 30, said. 'I was so sad, first off because my sister was so sad, but that, too, was the first time I saw [that] maybe I didn't know everything about the relationship.

Britney Spears was 'so sad' following her split from Justin Timberlake, according to sister Jamie Lynn Spears'Perhaps they were protecting me and obviously why would they talk to me about anything.'JamieLynn was only in her early teens when her big sister split up from Justin after four years together in 2002.

The Zoey 101 actress says she 'truly' does not know why the couple broke up.But her heart went out to Britney following the release of Timberlake's breakup track Cry Me A River, which all but accused the pop star of cheating on him andincluded a video of a Britney lookalike reaping the consequences of infidelity.

Power couple:JamieLynn was only in her early teens when her big sister split up from Justin after four years together in 2002; Spears and Timberlake pictured in 2001 'I thought how heartbreaking it must have been for my sister when Cry Me a River came out,' she said. 'Don't get me wrong, like, that's a way to launch your solo career, right?