I couldn’t believe that this truth, this bombshell for me, didn’t ever come to light," says the ‘Law & Order: SVU’ star about going public with her biological father’s identity in an HBO documentary on her mother,

Mariska Hargitay's stepmother, Ellen Hargitay, shares in the "My Mom Jayne" documentary the story of what Jayne Mansfield once told her in a dream.