Glitter and Sparkles

Yes, that's guest star Nicole Scherzinger alongside Robin. The former comes on board as the great Jessica Glitter.
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Sparkling

Who out there has not missed Robin Sparkles? We get more of her on the episode "Glitter."
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Nicole Scherzinger on HIMYM

Nicole Scherzinger guest stars as Robin's former co-star on Space Teens. She plays the character of Jessica Glitter.
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How I Met Your Mother Season 6 Episode 9 Quotes

Barney: SCIENCE! There is an 83% correlation between the times men wear boutonnieres and the times they get laid. Think about it, proms, weddings, grandmas funerals...Thanks for the redhead Nana. The everyday boutonniere, by Stinson.
Robin: Aaaand nope!

Marshall: Oh you're wearing a flower.
Barney: Thank You!
Marshall: I didn't compliment, just observed.