The HBO Original project about Jayne Mansfield is directed and produced by Hargitay and features interviews the "Law & Order: SVU" star conducted with her siblings, biological father and stepmother about the mom Hargitay never got the chance to really know.

Law & Order SVU” star Mariska Hargitay is making her feature directorial debut with a film about a subject close to her heart: her mother. That film, “My Mom Jayne,” premieres tonight, June 27, on HBO and Max.

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,