Heidi Montag's split from husband Spencer Pratt is apparently really not just another publicity stunt.

Two months after they split in what was many believed was just the former The Hills couple's latest publicity stunt, Montag has filed for divorce from Pratt in Santa Monica Superior Court, citing irreconcilable differences.

"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 on 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."

Montag had filed for legal separation from Pratt last month, however the fact she had not filed divorce papers had caused many -- including their family and former The Hills castmates -- to continue speculating that the filing was just the couple's latest move in an elaborate attempt to get back in the spotlight after they were dropped from the final episodes of the MTV reality series, which aired its series finale earlier this month.

"I think it's a joke," The Hills star Audrina Patridge said last month. "I don't believe it. They're inseparable and in love."

"I don't buy it," co-star Lauren "Lo" Bosworth added.  "I've worked with them for too long, and they haven't been filming, so I think this is a way they think they can get back on the show for the last few episodes."

"I doubt they're really broken up," The City star and former The Hills star Whitney Port said. "I'm sure they're still sticking together."

Reports of the couple's split had first surfaced in late May after Montag had moved out of their home less than two months after she had vehemently denied the accuracy of a sixth-season The Hills promotional trailer that had shown her suggesting she was going to divorce Pratt, whom she married in April 2009.

"I'm not moving out.  I love Spencer with all my heart," Montag said at the time.  "I'm so excited The Hills are finally over so I won't be edited by anyone. This will be the first time people can truly see us for who we are."