Longest celebrity relationships (65 images)

Mariska Hargitay (C) poses with her husband, Peter Hermann, and their children, left to right, Andrew, Amaya and August during an unveiling ceremony honoring her with the 2,511th star on the Hollywood Walk of Fame in Los Angeles on November 8, 2013. Hargitay and Hermann got married in 2004 after meeting on the set of "Law & Order: SVU" in 2002 and recently celebrated their 19th anniversary. Photo by Jim Ruymen/UPI

Ron Howard (L) and wife Cheryl Howard arrive for the Vanity Fair Oscar Party in Beverly Hills, Calif., on March 4, 2018. Ron and Cheryl Howard got married in 1975 after their first date in 1970. Photo by Christine Chew/UPI

Meryl Streep (L) and husband, Don Gummer, arrive for the Kennedy Center Honors at the U.S. Department of State in Washington, D.C., on December 1, 2012. Streep and Gummer got married in 1978. Photo by Ron Sachs/Pool

Marlo Thomas (L) and husband Phil Donohue pose at the GLAAD Media Awards in New York City on April 7, 2003. Thomas and Donohue got married in 1980. Photo by Laura Cavanaugh/UPI