Montag filed for legal separation in July, citing irreconcilable differences, but the couple fueled rumors they were giving their romance another go in early September when the "Hills" co-stars were spotted taking part in a charity walk together.
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They reunited again to celebrate the busty blonde's 24th birthday in Santa Barbara, Calif., on September 15, and were caught kissing on camera, with Montag's wedding ring clearly showing.
And the star has now decided to put an end to the divorce for good, filing a motion for dismissal at Los Angeles County Superior Court on Wednesday.
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