Barbra Streisand and Elliot Gould
Gould's early marriage to Streisand disintegrated when her career took off as his appeared to stagnate. Oh yeah, and she was dating Omar Sharif. They split in 1969— the same year that Gould's career, ironically, exploded. In 1970 he starred in M*A*S*H, along with three other big film roles, and become one of the top stars of the decade.