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Office Star Ellie Kemper Joining How I Met Your Mother

Ellie Kemper arrives at the 19th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 27, 2013 in Los Angeles (Photo by Getty Images) --Ellie Kemper arrives at the 19th Annual Screen Actors Guild Awards held at The Shrine Auditorium on January 27, 2013 in Los Angeles (Photo by Getty Images) --

Ellie Kemper is headed to a new small screen series.

The former "Office" star has signed on to appear on CBS' "How I Met Your Mother," according to TV Line.

The actress will play Cassie, a character "HIMYM" co-creators Carter Bays and Craig Thomas describe as "one of the most attractive, available, and -- as Ted discovers -- unfortunate guests at Barney and Robin's wedding," the website reported.

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So far, Ellie is only slated to appear in one episode during the show's final season.

Additionally, "The View" co-host Sherri Shepherd will also make a "HIMYM" appearance.

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"How I Met Your Mother" Season 9 premieres on September 23 at 8 PM on CBS.

-- Erin O'Sullivan

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