"Transformers" star Megan Fox on Friday filed for divorce from actor Brian Austin Green after five years of marriage, a Los Angeles court spokeswoman said.

The filing in Los Angeles Superior Court cited irreconcilable differences as the reason for the divorce. The filing came after media reports this week that the couple had separated. Fox, 29, is best known for starring in the blockbuster "Transformers" movie in 2007, and in a 2009 sequel. In 2008 she was named the world's sexiest woman in a poll by the magazine FHM.

She has said she met Austin Green, who appeared in the 1990s television show "Beverly Hills, 90210," when she was 18 and he was 30. They went on to date for years and married in 2010. The couple has two children together.

The 29-year-old actress and the 42-year-old former teen heartthrob - who is best known for the TV series Beverly Hills, 90210 - have two children together: Noah, aged two, and Bodhi, aged 18 months. 'Megan has separated from Brian,' a source told the weekly. 'They decided it six months ago.' Another friend added, 'Things have been rocky.' They were last seen together on June 9 in Beverly Hills.

When stepping out in LA in July and August, the actress did not have her wedding rings on. Their representatives have yet to comment. She's one of Hollywood's biggest pin ups thanks to her striking looks and now Megan Fox is turning into somewhat of a futuristic fashion icon too. Looking like a cross between a savvy fashionista and a raven-haired bombshell (the perfect combo), Megan hit the style spot in a show-stopping gown with a twist, in a David Koma dress plucked from the designer's SS14 collection.

Brian and Megan, who is 13 years her senior, previously split in 2009. He said at the time “Marriage isn’t a realistic goal for someone who is 23.” Just one year later he re-proposed and 24 days after that they tied the knot in Hawaii. In the past Megan gushed about her family, saying: "I love our family – I have a little football team that’s going to take care of me,’ she gushed.

"I like being around boys and being the centre of attention in my family because I’m the matriarch, the queen bee. "My husband is the sensitive type, he’s not macho. And I’m going to raise our boys like that: sensitive, sweet, chivalrous types." Following the birth of their first son second son last year the stunning actress revealed their eldest son Noah, now two, sleeps in the bed with them. She admitted: "Brian doesn't get any intimacy whatsoever." Megan also hinted that she is the one who is often left looking after the children- saying Brian only wanted more kids because "he doesn't have to do any of the work."