Olivia Wilde and Tao Ruspoli

Olivia Wilde and her husband, Italian Prince Tao Ruspoli, have separated, her rep tells TVGuide.com.

The House actress, 26, and Ruspoli, 35, split after eight years of marriage.

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"They have been living apart after trying for quite some time to make their relationship work," a source tells People.

Wilde eloped with Ruspoli, whose family owns Rome's Palazzo Ruspoli, when she was 18.

The actress most recently starred in Tron: Legacy and will next appear in Cowboys & Aliens and The Change-Up.