LOS ANGELES – Fifteen months after saying "I do," reality TV stars Heidi Montag and Spencer Pratt are headed for divorce.

The 23-year-old starlet and plastic surgery devotee filed for divorce Friday in Santa Monica, Calif., citing irreconcilable differences.

Representatives for Montag and Pratt did not immediately respond to requests for comment.

Montag began dating the 26-year-old Pratt while filming MTV's reality show "The Hills." The couple's April 2009 wedding was featured on the show.

Court documents show the two were legally married May 25, 2009, and separated on their one-year anniversary.

The media-hungry pair published a book together last year: "How to Be Famous: Our Guide to Looking the Part, Playing the Press, and Becoming a Tabloid Fixture."

Montag filed for a legal separation on June 8, which some dismissed as a publicity stunt.

In the divorce filing, she asked the court to deny spousal support to Pratt. The couple have no children.