Susan Sarandon and Tim Robbins, partners for 23 years, announce they separated over the summer

LOS ANGELES - One of Hollywood's most enduring couples has separated.

Susan Sarandon and Tim Robbins, partners for 23 years and parents of two sons, split up over the summer, publicist Teal Cannady said in a statement Wednesday. She did not elaborate.

Sarandon, 63, and Robbins, 51, met while shooting the 1988 film "Bull Durham." He played a hotshot pitcher, she was the passionate fan who simultaneously seduced him and prepared him for the big leagues.

Sarandon and Robbins never married. Instead, they have been compared to other longtime Hollywood pairs who remain committed despite never officially tying the knot, such as Goldie Hawn and Kurt Russell.

Sarandon stars in "The Lovely Bones," opening worldwide next month. Robbins last appeared in 2008's "City of Ember."