AceShowbiz -

Rumors are flying that Drew Barrymore's marriage to Will Kopelman is on the rocks. The couple reportedly have decided to end their relationship after three years of union. "They've been having trouble for a while now," an insider told OK! magazine. "They tried living apart, but it didn't help - and now they've decided to split."

Kopelman is Barrymore's third husband and she is known to have short marriages to her previous two husbands. She split from bar owner Jeremy Thomas after 19 days in 1994 and divorced from actor Tom Green after five months in 2001. Her marriage to Kopelman may last longer and produce two offsprings but it reportedly was a doomed relationship from the start.

They had been dating a little over the year when she got pregnant with their first daughter. They were married in June 2012 in Montecito, California. "It was a whirlwind. They wanted to see it through because they were expecting," said an insider.

Barrymore and Kopelman are now allegedly fighting for the custody of their 3-year-old daughter Olive and 18-month-old daughter Frankie. Barrymore is worth $140 million while he's worth $10 million.

There is yet confirmation from Barrymore and Kopelman. In a recent interview with PEOPLE, Barrymore said her priority was her daughters. "I know everyone says you're supposed to put your coupledom first. But I really love it being all about the kids," she shared. "Maybe that's my compensating for not having parents myself or a childhood, but right now, the focus is about how we're figuring things out as parents."