'Smash': Megan Hilty belts out 'I'm Goin' Down' and Uma Thurman sings 'Happy Birthday'

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Ivy ( Megan Hilty) seems to finally be waking up to the fact that her relationship with Derek ( Jack Davenport) is going nowhere on Monday's (April 30) episode of "Smash," when it looks like he's planning to hook up with yet another of his leading ladies -- "Bombshell" star Rebecca Duvall ( Uma Thurman).

In the sneak peek clip above, Ivy channels her frustration and some Mary J. Blige-style gumption into belting out a cover of Rose Royce's "I'm Goin' Down."

Also in this episode, Rebecca gives Derek a little birthday surprise, singing a heavy-lidded version of "Happy Birthday" as Marilyn Monroe. Check out the video below.

"Smash" airs Monday at 10 p.m. on NBC.
Photo/Video credit: NBC