Another celebrity couple's marriage is the subject of rumor mills as reports claim that Megan Fox and Brian Austin Green have split up. According to Us Weekly's source, the two decided to separate six months ago. The 29-year-old actress and 42-year-old "Beverly Hills 90210" alum have two children together, Noah, aged 2, and Bodhi, 18 months. Green has a son, Kassius, 13, with ex Vanessa Marcil. 

The website reports that sources remain vague about the cause of their split, with one insider saying that "things have been rocky." 

The "Transformers" star met Green on the set of her sitcom "Hope & Faith" back in 2004. They got engaged in 2006, but they called it off in 2009. The pair continued to spend time together despite publicly calling it quits, and eventually Green proposed again in June 2010. Days after announcing their plans to marry, they tied the knot at the Four Seasons in Hawaii. 

Last year, Fox told Men's Health magazine that she feels relationships are never perfect. 

"You can't live in fantasyland and think that everything's going to be perfect all the time," she said. "You will go through phases where you're just not getting along...That's going to happen, and it's going to feel impossible to you sometimes." 

Fox added that arguments are normal and unavoidable in a relationship, but despite difficulties, she called Green her soul mate. She said that the actor was "definitely meant to be the father of my children." 

They were last seen together on July 9. The two have yet to comment on the reports.