Jon Hamm and Jennifer Westfeldt have called it quits after 18 years together, People reports.

"With great sadness, we have decided to separate, after 18 years of love and shared history," the couple told People in a joint statement.

"We will continue to be supportive of each other in every way possible moving forward."

The couple was last spotted at the premiere after-party for Netflix's "Wet Hot American Summer: First Day of Camp" on July 22 in New York.

The "Mad Men" actor completed rehab earlier this year, after acknowledging Westfeldt for supporting him every step of the way.

In 1997 the pair began dating, and in 2011 starred together in the film "Friends with Kids."