By Christopher Rosen
Updated September 07, 2015 at 09:41 PM EDT
Evan Agostini/Invision/AP

Jon Hamm and Jennifer Westfeldt have split after 18 years together. The couple released a statement to PEOPLE to announce their break-up.

“With great sadness, we have decided to separate, after 18 years of love and shared history,” Hamm and Westfeldt said. “We will continue to be supportive of each other in every way possible moving forward.”

Earlier this year, after Hamm completed a 30-day stint in rehab for alcohol abuse, the couple denied rumors that their relationship was ending. “The story that appeared in this week’s edition of In Touch magazine is not true,” a representative for the couple told PEOPLE at the time, after In Touch reported that Hamm and Westfeldt had split. “The only gentleman Jennifer visited regularly in Connecticut was Jon, while he was in rehab. They continue to ask for the public’s understanding and sensitivity during this challenging time.”

Hamm shot to fame playing Don Draper on Mad Men, but one of his early film roles was opposite Westfeldt in 2000’s Kissing Jessica Stein, which the 45-year-old actress also co-wrote. Hamm, 44, also appeared with Westfeldt in 2006’s Ira & Abby, written by Westfeldt, and 2011’s Friends with Kids, Westfeldt’s directorial debut.

“There’s another person who’s actually sitting in the audience who basically told me when I wasn’t working that I was still talented,” Hamm said of Westfeldt at the PEOPLE Magazine Awards last year. “And she’s stuck with me for the last 16 years, even if the talent question remains up for grabs.”

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