First Look at 'How I Met Your Mother' Musical Episode

The cast were doing a two-and-a-half minute piece called 'Nothing Suits Me Like a Suit' which was filmed over two days in the FOX's studio lot of New York Street.

The first look into the 100th and the first musical episode of "How I Met Your Mother" has been shared. Beside teasing on the main cast such as Neil Patrick Harris, Cobie Smulders and Josh Radnor in suits, the promotional photos also unveil Stacy Keibler's role as a hot bartender named Karina who is annoyed by Barney's fashion.

"Barney needs to nail the hot bartender that works at MacLaren's," Harris told IGN previously. "Oddly, he's never banged a hot bartender before. He has a lot of conquests, but never a hot bartender." Unfortunately, Karina is not a fan of guys in suits leading to a choice for Barney to ditch the suits and bang her or to keep his suits and sing about it.

The monumental episode is called "Girls Versus Suits", a homage to Barney's custom of wearing one. It will air on January 11 at 8/7c and present other guest stars such as Rachel Bilson and Tim Gunn. The former is playing the role of Cindy whom Ted wants to get to know of while the mentor of "Project Runway" will play Barney's personal fashion consultant slash tailor.

There will be a grand musical number featuring 65 dancers and 50-person orchestra, USA Today reported. Composition was arranged by John Swihart but the words and music were exec producers Carter Bays and Craig Thomas' job. For the choreography, they hired Zach Woodlee who also worked on "Glee".

Beside presenting musical numbers and Barney pursuing Karina, the episode will reveal more about the burning question. "It's the closest we've seen Ted get to answering the question: 'Who is the mother?' ," Thomas revealed.