The 25-year-old actress has cited "irreconcilable differences" in court papers seeking to end her two-year marriage to former American Idol contestant Paul.
Nikki, who played Rosalie Hale in Twilight, confirmed her split from Paul in March 2014, revealing they'd been living separately for the past six months due to work commitments.
At the time, a rep said: "They remain best friends and look forward to their continued journey together."
Part of that continued journey is a planned album, I'm Not Falling, scheduled for release later this year. The duo have previously collaborated on music together, including the song 'All I've Ever Needed', which was included in the Twilight Saga: Breaking Dawn – Part 2 soundtrack.
Nikki and Paul's first meeting was captured on TV. It took place at the premieire of her movie Red Riding Hood in LA, where the American Idol contestants were special guests and being filmed for the show.
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