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Megan Fox, Brian Austin Green, Golden Globes

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Megan Fox and Brian Austin Green have separated, a source tells E! News.

The actors, who began dating in 2004 and got married in 2010, reportedly decided to take some time apart "six months ago," a source reveals in Us Weekly's Aug. 31 issue, on newsstands Friday. An insider told the tabloid that "things had been rocky" between the actors, who met on the set of the ABC sitcom Hope & Faith.

Though they are no longer a couple, Megan and Brian have remained amicable. "They're on friendly terms for the sake of the kids," an insider told Us Weekly. "They just want to do their own things." Similarly, a source tells People, "They will always love each other very much and are devoted to their kids. Anything could happen in the future, but for now they've decided it's best to take some time apart."

The exes have two sons together: Noah Green, 2, and Bodhi Green, 18 months. Brian has a son, Kassius Green, 13, from a prior relationship with actress Vanessa Marcil, with whom he starred on Beverly Hills, 90210. Megan, 29, and Brian, 42, were last seen together in Beverly Hills June 9. Megan stepped out sans wedding ring (with her kids) Sunday; Brian was spotted wearing his ring at a gym in L.A. Aug. 6.

Megan and Brian got engaged in 2006, called it off in 2009, and got engaged a second time in 2010. Days after announcing their plans to marry, the two got married in Hawaii, their favorite vacation destination. In 2012, Megan gushed about marriage in a Cosmopolitan cover story. "We've had obstacles, and we've overcome them. I truly feel like he's my soul mate," she said of her husband. "I don't want to sound corny or cliché, but I do believe we are destined to live this part of our lives together." The next year, she told Marie Claire U.K., "We are tolerant of each other and we try to be patient with each other, and I don't try to turn him into me and he knows not to try to turn me into him." By mid-2014, the actors and their children moved into a $3.35 million mansion in L.A.'s Los Feliz neighborhood.

So, what went wrong?

"They fight about her career," a source tells Us Weekly of Fox, who spent the summer shooting the sequel to Teenage Mutant Ninja Turtles in New York City. "He would prefer she focus on the family more than being obsessed with getting roles."

Brian, meanwhile, wrapped FX's Anger Management in 2014.

Reps for the actors have not responded to E! News' request for comment.