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Katharine McPhee, Megan Hilty, Smash

NBC

Remember the time Derek hooked up with Rebecca on Smash and we all went "WTF?!" at our TV screens?

If you were one of those people, then this is the clip for you. We've got an exclusive first look at next week's episode, "Preview," and as you can guess by the title, Bombshell is officially previewing in Boston.

But what does this have to do with Rebecca (Uma Thurman) and Derek (Jack Davenport)? Well…

…she's nowhere to be found in the number!

Did Derek already dismiss her from the role of Marilyn? Or did he just give this number to his other muses, Karen (Katharine McPhee) and Ivy (Megan Hilty)? Either way, we're the ones who win out, because the number is amazing and we get to enjoy it!

Check out the clip below, and then head on down to the comments section to spitball your theories.

Smash airs Monday nights on NBC.

(E! and NBC are both part of the NBCUniversal family.)