Zap2it can at least reveal that both women get dolled up in their Marilyn best for the episode, as seen in these exclusive behind-the-scenes photos....
On Monday's (April 9) all-new "Smash," Karen (Katharine McPhee) gets the chance to step up as understudy for Marilyn when star Rebecca Duvall (Uma Thurman) gets delayed....
Then see Ivy dazzle potential "Marilyn" investors, while Karen (Katharine McPhee) fantasizes that it's her in the lead role....
Also, this week on NBC's "Smash," we learn the side effects of prednisone use, which may include cold sweats, headaches, singing Jessie J songs in the mirror, and hallucinations of Katharine McPhee as Marilyn Monroe....
"Smash" takes a detour from the lights of Broadway on Monday as it follows Karen (Katharine McPhee) home to Iowa....