Montag filed for legal separation from Pratt nearly two months ago.
The former couple have appeared together on "The Hills" and "I'm a Celebrity... Get Me Out of Here!"
"Heidi has amended her petition for separation and today has filed a petition for dissolution of marriage from Spencer Pratt," Montag's lawyer, Jodeane Farrell, told People.com Friday. "The couple has agreed they would like their divorce to be finalized in a timely manner in an out-of-court settlement. Both parties are amicable with each other and over the possibility of finalizing their divorce."
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