'How I Met Your Mother' actor Neil Patrick Harris has been finally confirmed to join the ongoing season 4 of 'American Horror Story,' entitled 'Freak Show,' after many speculations by fans and the media.

Harris has expressed his desire to be a part of the series after watching some of its previous seasons, and show creator, Ryan Murphy did not ignore the actor's request.

Harris was initially offered a role in the first season of American Horror Story (Murder House), but turned it down for some undisclosed reasons. After seeing the success of the show and growing fanbase support, the upcoming Academy Awards host is finally appearing in Freak Show, alongside his husband, David Burtka.

According to a report by TVLine, Harris will appear in episodes 11 and 12 as a "chameleon salesman," while Burtka's advent is set for the season finale (episode 13) as a character connected to Elsa Mars (Jessica Lange). It is quite surprising that the real life pair won't appear together with each other, but in the world of American Horror Story, anything is possible.

Murphy stated that instead of just accepting a role, Harris had an idea what he wanted to portray in the series. It will be no surprise if Harris' character turns out to be freakishly colorful and vividly wild.

"He had very specific ideas for what he wanted to do, and I had very specific ideas, so we're working on melding those," said Murphy of Harris, in a report by TVLine.