Nikki Reed and Paul McDonald have split up.

The 'Twilight Saga' actress and the former 'American Idol' contestant, who tied the knot in October 2011 after a whirlwind romance, have decided to formally separate but they "remain best friends."

A spokesperson for the 25-year-old beauty told PEOPLE.com: "After much consideration, Nikki Reed and Paul McDonald are ending their marriage. They have been living separately for the past six months due to work obligations."

The former couple, who first met on the red carpet for the premiere of 'Red Riding Hood' in March 2011, started working on a full-length album together last year and Reed's spokesperson insisted there is no animosity between them and they are still working on the project, saying: "They will continue to share their love of music, and are still working on their debut album, 'I'm Not Falling,' releasing in 2014. They remain best friends and look forward to their continued journey together." 

Reed previously claimed that music was the secret to their happy marriage and that McDonald, 29, was her number one priority.

Last year, she said: "I feel like especially being in this crazy, weirdo world that we're in, where we're making movies and people are on tour, it's just so easy to lose track of what's important.

"I feel like it's really important to just be with each other and make the other person a priority."