By Michael Ausiello
August 26, 2010 at 10:38 PM EDT

Image Credit: Tommaso Boddi/PR Photos; Cliff Lipson/CBSHow I Met Your Mother is about to fill in a major piece of Robin Sparkles’ pop-star backstory.

Sources confirm to me exclusively that Pussycat Doll-turned-Dancing With the Stars champ Nicole Scherzinger has been tapped to play Jessica Glitter, Robin’s former BFF and costar of the Canadian talk show that also featured Alan Thicke.

“It’s going to be a satisfying third chapter in the Robin Sparkles trilogy,” says executive producer Craig Thomas. “It’s a prequel to both ‘Let’s Go to the Mall‘ and ‘Sandcastles in the Sand.'”

Adds fellow EP Carter Bays: “It’s the origin story of Robin Sparkles. You see where she came from.”

The Sparkles & Glitter flashback episode, simply titled “Glitter,” is slated to air during November sweeps. (Additional reporting by Vlada Gelman)