Kate Winslet is apparently being supported through her marriage break-up by Leonardo DiCaprio.

The actress turned to her Titanic co-star when problems started to surface in her relationship with director Sam Mendes as the trio worked together on 2008 movie Revolutionary Road. And now the marriage has broken down completely she is said to be relying on his support to get through this difficult time.

A source told the U.K’s The Sun newspaper: “Leonardo and Kate have been like brother and sister since they starred in Titanic together.

“And since Kate’s marriage problems started, around the time they were filming Revolutionary Road, they’ve got closer again. Kate feels like she can tell Leonardo anything.

"They were thrust into stardom together and were the only people who knew what the other was going through. He's been a rock for her."

While Kate obviously has a close friendship with Leo, it was Sam’s bond with 27-year-old actress Rebecca Hall that reportedly caused of many of the estranged couple’s rows.

The director first met Rebecca in 2006 on the set of movie Starter For 10 and then worked on two theatre productions with the actress, in New York and London, as part of his Bridge Project theatre company last summer.

A source said: “Sam is a huge admirer of Rebecca’s work. He really worked well with her. There’s no suggestion of anything untoward but undoubtedly the friendship didn’t help mend their struggling relationship.”

Kate and Sam, who were married in May 2003, announced their split on Monday, but friends claim they have been living apart for several months.
 
Leo and Kate… brother and sister? Hmmm… given their obvious onscreen chemistry  we’ll let time be the judge of how sibling-like that relationship really is…

Photos: Elite