Heidi Montag

Heidi Montag has filed for legal separation from Spencer Pratt.

The Hills star filed papers Tuesday at a Santa Monica, Calif., courthouse without a lawyer, a court clerk told TVGuide.com. Montag listed June 8 as the date of separation and cited irreconcilable differences.

Under a legal separation, each party's earnings received after the date of separation will be considered separate property.

The filing comes a week after Montag announced that she has moved out of the Pacific Palisades home she has shared with Pratt, 26, whom she has dated since 2006 and married last year.

Heidi Montag on break with Spencer Pratt: "I needed some alone time"

"I needed some alone time," she said at the time. "There are so many lies out there about me and I just needed space — even away from my husband."

Montag, 23, is currently living with her friend, Hills guest star Jen Bunney. The two are shooting a new reality show together this summer.