Supermodel Christie Brinkley and her fourth husband, Peter Cook, have separated, her publicist said Tuesday.

"Yes, it's true. The couple has separated," publicist Elliot Mintz said in a statement.

Cook and Brinkley married in 1996 and have a daughter.

Brinkley, 52, was previously married to Frenchman Jean-François Allaux, singer Billy Joel and developer Richard Taubman.

She and Joel have a daughter, and she and Taubman have a son.

"Her immediate concern is for her children, and she's hoping during this obviously difficult time that people will be kind enough to respect her privacy," Mintz said.