Mad Men Actress and SNL Star Are Engaged
01/23/2009 AT 02:15 PM EST
Moss first leaked the happy news to USAWeekend.com Thursday.
"It happened just a few days ago," said the actress, who is nominated for a SAG Award for best actress. "It's private, so I don't want to share the details of how it happened, but I will say it was perfect."
Armisen, 42, joined Saturday Night Live in 2002 and has recently made headlines for his portrayal of President Barack Obama.