“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 couple said in a joint statement, reports people.com.
Having been plagued with split rumours for months, Hamm, 44, and Wesfeldt, 45, were last seen publicly together on July 22 in New York at the premiere after-party for Netflix’s “Wet Hot American Summer: First Day of Camp”, where they were “canoodling” with each other, according to reports.
Earlier this year, the “Mad Men” star completed rehab for alcohol abuse and credited Westfeldt for supporting him throughout his treatment.
In April, the couple even released a statement denying reports they had broken up.
The two began dating in 1997 and starred together in the 2011 film “Friends with Kids”.