Cristin Milioti

Actress Cristin Milioti attends the 78th annual Drama League Awards Ceremony and Luncheon at the Marriott Marquis Times Square on May 18, 2012, in New York.

Nominee Cristin Milioti attends the 66th annual Tony Awards at The Beacon Theatre on June 10, 2012, in New York.

Tina Fey and Cristin Milioti in the 2011 "30 Rock" episode, "TGS Hates Women."

Steve Kazee and Cristin Milioti speak at the 27th Annual Lucille Lortel Awards at NYU Skirball Center on May 6, 2012, in New York.

Steve Kazee, left, and Cristin Milioti are shown in a scene from "Once" in New York.

"Once" stars: Steve Kazee and Cristin Milioti — Brad Barket/Getty Images

Steve Kazee and Cristin Milioti on the opening night of "Once" at The Bernard B. Jacobs Theatre on March 18, 2012, in New York.

BroadwayWorld.com/Boneau Bryan-Brown,Joan Marcus

Steve Kazee, left, and Cristin Milioti are shown in a scene from "Once" in New York.

Matt Oberg and Cristin Milioti are seen here in the 2013 film, "Bert and Arnie's Guide to Friendship," which follows the romantic misadventures of Bert Sheering (Oberg), a sophisticated, yet sexually repressed author, and Arnie Hubert (Stephen Schneider), a no-nonsense executive and unabashed ladies man.

Viewers finally met The Mother (Cristin Milioti) as she buys a ticket out to Barney and Robin's wedding in Farhampton, on the eighth season finale of "How I Met Your Mother."