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HOW I MET YOUR MOTHER, Josh Radnor, Katie Holmes

Monty Brinton/CBS

Sometimes the Slutty Pumpkin isn't all she's cracked up to be.

That's the lesson Ted (Josh Radnor) presumably learns in How I Met Your Mother's Halloween episode when he finally comes face-to-face with Naomi (Katie Holmes), the Slutty Pumpkin that got away on Halloween ten years ago.

We've got your sneak-peek video of Holmes' highly-anticipated appearance on the CBS hit comedy, which airs Monday...

While Naomi thinks she and Ted are like two puzzle pieces, he can't even get comfortable holding her hand while stargazing on the roof. Ruh roh! Things don't seem to improve when Naomi's hair lands in Ted's nose. Um? Ew!

During the episode, Ted and Naomi head back the roof party where they first met (wearing their original costumes!) and hang out with shirtless Barney (Neil Patrick Harris) and Robin (Cobie Smulders). Prepare for some adorableness between the two as Robin teases Barney for being part Canadian. (Gasp!) Can you say epic How I Met Your Mother Halloween episode? 'Cause we can!

Watch the clips and then head on over to the comments to discuss Holmes' HIMYM debut! Is she everything you thought the Slutty Pumpkin would be and more?

PHOTOS: Trick-or-Treat! TV Halloween Costumes