From five-second cameo to series regular...

After her brief, albeit VERY memorable, guest-starring turn on the How I Met Your Mother Season 8 finale, Cristin Milioti has been promoted to series regular for the ninth and final season of this beloved CBS sitcom.

As first reported by TV Line, Miloti's ascension marks the first time HIMYM has expanded its core roster beyond Josh Radnor, Alyson Hannigan, Neil Patrick Harris, Cobie Smulders and Jason Segel.

Look for her to play a critical role this fall, as How I Met Your Mother creators have said Season 9 will actually take place over the course of Barney and Robin's wedding. That ought to be interesting.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.