Source: Scientology broke up Moss, Armisen

It's really over.

Elisabeth Moss filed divorce papers in Los Angeles Monday to end her brief marriage to Fred Armisen, Entertainment Tonight confirms.

The Mad Men actress, 28, wed the Saturday Night Live performer, 43, last October.

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According to court documents, the couple have been separated since late June.

"They had issues," one insider told Us Weekly of the short-lived pair. One of those issues? Moss's ties to the Church of Scientology.

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"Her religion was as important to her as their marriage, if not more," another pal told Us. "He could not get with it."

Armisen isn't brooding on his own. After their separation, he connected with SNL costar Abby Elliot, 23. "Fred sought comfort in her after the split," another source says, adding that Moss is "fine" with his new relationship.

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"They are both moving on."