Olivia Jane Cockburn, better known by her screen name Olivia Wilde (born March 10, 1984 in New York City, New York), portrays the mysterious fellow, Number 13, whom House manipulated Cuddy into hiring in Season 4.

Despite having fewer credits than the other two actors who were hired in Season 4, she has received considerably more exposure in television and film, starting her career in 2003 with six episodes of Skin. She also managed to win a supporting role in The Girl Next Door after being on set in another capacity for over a month. Just before joining the cast of House, she appeared as Jenny Reilly in The Black Donnellys. In addition, she has become a regular fixture on Maxim's 100 Sexiest Women In The World and in 2009 finished #1. She is also a vegan and was voted PETA's Sexiest Vegetarian Celebrity of 2010.

Watch for Wilde in 2010's Tron Legacy and 2011's Cowboys & Aliens and The Change-Up.

Her parents Andrew and Leslie were the writers and co-producers of The Peacemaker starring George Clooney and Nicole Kidman.

Wilde took off part Season 7 off to appear in the movie Cowboys & Aliens. She has signed for Season 8, but will also be taking time off from the series to work in other projects.

She will be in the 150th episode. Source

In addition to the finale, she will also appear in the penultimate episode on May 14. Source