Demi Moore and Ashton Kutcher announced Thursday they are ending their six-year marriage and an insider revealed that the couple had an open relationship.

"Everyone in Hollywood knows about their arrangement, but they’ve managed to keep it a secret from the general public,” said a source to Star.

The source also claimed Moore is bisexual.

"Demi is attracted to women just as much as men, so she didn’t always get all she needed from Ashton...she was cool with Ashton having flirtatious relationships too. Somehow they made it work all these years. Both of them were respectful of each other. It was a lot of fun for them," the source added.

Kutcher allegedly cheated on the eve of his six-year marriage anniversary to Moore while in San Diego. Sara Leal, 22, told Us Weekly that she was intimate with Kutcher on Sept. 24. Leal also claimed Kutcher told her he was separated from Moore at the time.

The couple expressed sadness over the conclusion of their marriage.

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“It is with great sadness and a heavy heart that I have decided to end my six-year marriage to Ashton. As a woman, a mother and a wife there are certain valued and vows that I hold sacred, and it is in this spirit that I have chosen to move forward with my life. This is a trying time for me and my family, and so I would ask for the same compassion and privacy that you would give to anyone going through a similar situation," Moore said in a statement to the Associated Press.

Kutcher tweeted: “I will forever cherish the time I spent with Demi. Marriage is one of the most difficult things in the world and unfortunately sometimes they fail. Love and Light, AK.”

The couple married in September 2005, and Kutcher became the stepfather to Moore's three daughters: Rumer, Scout, and Tallulah Belle.