Jon Hamm, 44, and Jennifer Westfeldt, 45, have split after 18 years together.

The former couple said in a joint statement, "With great sadness, we have decided to separate, after 18 years of love and shared history. We will continue to be supportive of each other in every way possible moving forward."

The two met through a mutual friend nearly twenty years ago, and though they've been together since 1997, they never got married or had kids. Back in 2011 Hamm told The Hollywood Reporter, "I have a tremendous amount of respect for my friends who do balance this particular career with raising a kid, 'cause it's a tricky environment to bring them into... So not for us just yet." Yet? More like never!

A source tells Us Weekly, "They've been fighting for a while, but now they're done. They decided to finally split. It's sad." When Hamm went to rehab back in April for alcohol addiction, there were reports that the duo had split, but the Mad Men star's rep quickly shot those down.

The last time the two appeared in public together was back in January at the Broadway show On the Town.