Despite rumors to the contrary, Mad Men star Jon Hamm is not engaged to his longtime girlfriend, Jennifer Westfeldt, but she says that tying the knot would really just be a formality. “We have always felt married,” Jennifer told In Touch at the WET’s LOVE 2010 Benefit in NYC on April 19. “We just had our 12-year anniversary last week, and we have a house and a dog! At some point we may, but it doesn’t matter to us one way or the other.” And it also doesn’t mean they won’t be starting a family. “It’s definitely something we’re talking about,” she says.