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Susan Sarandon, Tribeca Film Festival

Dimitrios Kambouris/Getty Images for IWC

Diamonds may be a girl's best friend, but what about her mother?

Lifetime's upcoming Marilyn Monroe miniseries is about to take a closer look at the bombshell's mother and how she affected the iconic star for better or for worse, and now we know who's going to portray the mother of all drama. 

And this casting. Is. So. Perfect.

Eternally amazing and all-around fabulous person Susan Sarandon just landed the meaty role in Marilyn, E! News has confirmed, and we seriously can't get over how brilliant this casting is. 

The Oscar winner will portray Marilyn's mentally ill mom, whose struggle with her own demons had a profound affect on her famous daughter's life.

While we're still waiting with bated breath to see who will take on the title role (might we suggest a certain blonde-haired beauty who we already know can belt with the best of them? Sorry, Smash, we'll never let go!), we're so excited to see Sarandon back on our TVs. The movie star's most recent TV guest starring gigs were on Mike & Molly and The Big C.

The Lifetime production, which will be a four-hour miniseries, is based on J. Randy Taraborrelli's book The Secret Life of Marilyn Monroe. It's set to premiere in 2015.

What do you think of Sarandon as Mama Monroe?