Thes actress playing Marilyn kept reminding me of...

THANK YOU!!! I could NOT place it. Now I know. Ugh. I can sleep now. : )

I saw it too. I think it is the way she holds her mouth. Half open.

I never apologize, Lisa. I'm sorry, but that's just the way I am. Homer Simpson

Funny you mention that because the actress who plays Mellie Grant [Bellamy Young] tweeted KellI Garner congratulating her on the movie after it aired. Apparently, they're friends.

The way that Bellamy Young acts with her expressions are the same. It was bothering me too but it didn't take long for me to figure it out. For a sec I thought it was Bellamy.