Olivia Wilde Separates from Italian Prince Husband

2/8/2011 1:30 PM PST

Olivia Wilde and Tao Ruspoli Separated

"House" star Olivia Wilde has officially separated form her husband Tao Ruspoli ... eight years after the two eloped ... back when Olivia was just nineteen.

Wilde and Ruspoli have been living apart for a while and have mutually agreed to separate, according to People.com.

Olivia and Tao -- an Italian prince whose family owns Rome's Palazzo Ruspoli -- were married in secret back in 2003 ... on a school bus in Virginia. Nice.