Porn star Jenna Jameson is expecting either Rachel McAdams or Sienna Miller to play the lead role in her biographical flick.The pron star hopes of Scarlett Johansson playing the lead roled dashed when the actress made it very clear that she has no intrest in playing the role.So Jenna now hopes to rope in eithr Rachel McAdams or Sienna Miller.The porn star says,"I think Rachel McAdams is amazing, and Sienna Miller." The movie is based on the the porn stars bestselling autobiography, How To Make Love Like A Porn Star.The porn star recently removed her breast implants.