Ashton Kutcher, Demi Moore Work on Marriage at Bruce Willis’ Vacation Home

 Amanda Edwards/WireImage.com

Is there still hope for Ashton Kutcher and Demi Moore

Last weekend, the estranged spouses sought refuge in a surprising venue: Moore's ex-husband Bruce Willis' vacation home in Turks and Caicos. "They had to get away," a source tells the new Us Weekly, on stands Friday. "Ashton's tweeting [about Penn State] was the last straw." (Last week, Kutcher unwittingly stood up for ousted Penn State football coach Joe Paterno, who was fired amidst a huge child-abuse sex scandal. He later apologized for the incident.)

Kutcher, 33, and Moore, 49, spent time evaluating their marriage following a rocky few months that included Us Weekly's revelation of the Two and a Half Men star's infidelities with 22-year-old Sara Leal.

VIDEO: Sara Leal opens up about her affair with Ashton

"Things have been very strained," a source tells Us. "[But] they're trying to figure things out," a source tells Us

For more on Ashton and Demi's trip therapy, check out the new Us Weekly, on stands Friday.

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