After 18 years together, Jon Hamm and Jennifer Westfeldt have decided to go their separate ways, ET confirms.
"With great sadness, we have decided to separate, after 18 years of love and shared history," the couple tells ET in a joint statement. "We will continue to be supportive of each other in every way possible moving forward."
The couple's last public appearance together was in late July, following the premiere of Netflix's Wet Hot American Summer: First Day at Camp. The two appeared together in 2011's Friends With Kids, which Jennifer wrote and directed. That film was produced by Points West Pictures, the production company that Jon and Jennifer started together in 2009.
In April, Jon shot down rumors that he and Jennifer had split up.
"The story that appeared in this week's edition of In Touch magazine is not true," the couple's rep said in a statement to People at the time. "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."
Click to see images of the former couple:
Jon Hamm and Jennifer Westfeldt
Jon Hamm and Jennifer Westfeldt break up after 18 years
BEVERLY HILLS, CA - DECEMBER 18: Actors Jon Hamm (L) and Jennifer Westfeldt attend The PEOPLE Magazine Awards at The Beverly Hilton Hotel on December 18, 2014 in Beverly Hills, California. (Photo by C Flanigan/Getty Images)
NEW YORK, NY - JANUARY 05: Jon Hamm and Jennifer Westfeldt attend the 'Girls' season four series premiere after party at The Museum of Natural History on January 5, 2015 in New York City. (Photo by Jamie McCarthy/Getty Images)
NEW YORK, NY - DECEMBER 08: Jon Hamm and Jennifer Westfeldt attend 'Into The Woods' World Premiere - Outside Arrivals at Ziegfeld Theater on December 8, 2014 in New York City. (Photo by Rob Kim/Getty Images)
NEW YORK NY - OCTOBER 26: Jon Hamm and Jennifer Westfeldt sighting on October 26, 2014 in New York City.
(Photo by Josiah Kamau/BuzzFoto/FilmMagic)
LOS ANGELES, CA - AUGUST 25: Jon Hamm and Jennifer Westfeldt arrives at the 66th Annual Primetime Emmy Awards at Nokia Theatre L.A. Live on August 25, 2014 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
NEW YORK, NY - APRIL 15: Jon Hamm and Jennifer Westfeldt attend the Opening Night After Party for 'The Library' at The Public Theater on April 15, 2014 in New York City. (Photo by Walter McBride/WireImage)
LOS ANGELES, CA - JANUARY 23: Jon Hamm and Jennifer Westfeldt are seen as they take their dog for a walk on January 23, 2014 in Los Angeles, California. (Photo by Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 20: Jennifer Westfeldt and Jon Hamm arrive at AMC's 'Mad Men' season 6 premiere held at DGA Theater on March 20, 2013 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
WEST HOLLYWOOD, CA - FEBRUARY 24: (EXCLUSIVE ACCESS SPECIAL RATES APPLY; NO NORTH AMERICAN ON-AIR BROADCAST UNTIL FEBRUARY 28, 2013) Actors Jon Hamm (L) and Jennifer Westfeldt attend the 2013 Vanity Fair Oscar Party hosted by Graydon Carter at Sunset Tower on February 24, 2013 in West Hollywood, California. (Photo by Larry Busacca/VF13/WireImage)
NEW YORK, NY - JUNE 20: Actors Jon Hamm and Jennifer Westfeldt attend The Cinema Society with The Hollywood Reporter & Piaget and Disaronno screening of 'To Rome With Love' at the Paris Theatre on June 20, 2012 in New York City. (Photo by Jim Spellman/WireImage)
68th ANNUAL GOLDEN GLOBE AWARDS -- Pictured: (l-r) Jon Hamm and Jennifer Westfeldt during the 68th Annual Golden Globe Awards held at the Beverly Hilton Hotel on January 16, 2011 (Photo by Vince Bucci/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - AUGUST 29: Actress Jennifer Westfeldt (L) and actor Jon Hamm arrive at the 62nd Annual Primetime Emmy Awards held at the Nokia Theatre L.A. Live on August 29, 2010 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)
(EXCLUSIVE, Premium Rates Apply) HOLLYWOOD - APRIL 22: Actress Jennifer Westfeldt and actor Jon Hamm attend US Weekly's Hot Hollywood 2009 held at My House on April 22, 2009 in Hollywood, California. (Photo by Jeff Kravitz/FilmMagic)
Jon Hamm and Jennifer Westfeldt during 1st Annual 'Show People' Tony Awards Party at Gotham Hall in New York City, New York, United States. (Photo by Djamilla Rosa Cochran/WireImage)
Jennifer Westfeldt and Jon Hamm (Photo by Bruce Glikas/FilmMagic)
In March, the 44-year-old actor completed his treatment program with Jennifer by his side.
"With the support of his longtime partner Jennifer Westfeldt, Jon Hamm recently completed treatment for his struggle with alcohol addiction. They have asked for privacy and sensitivity going forward," his rep said in a statement to ET then.
In May, Jon seemed healthy and poised to move on from his now iconic role as Don Draper on Mad Men, which wrapped up its final season that month.
"I'm very happy," Jon said when asked how he felt about the outcome for his celebrated character. "I'm also happy that I get to go do other things too. It's a very bittersweet kind of thing. A mixture of feelings."
Of the shows legacy, Jon says, "The hope is... that the impact will outlast its time on television."