09/20/2010 AT 7:30 PM ET
Elisabeth Moss is making her split with Fred Armisen official.
The Mad Men actress, 28, filed divorce papers Monday in L.A. Superior Court, citing irreconcilable differences.
A source previously told PEOPLE the couple’s conflicting work schedules and long-distance relationship were causes for their split.
Armisen, 43, has since moved on with his SNL cast member Abby Elliot, 23. The two have been quietly dating and their relationship is still in “the early stages,” says a source.