While a representative for the couple declined to comment, E! also reported that about 110 guests had been invited to the ceremony.
The relationship status of the 22-year-old Montag and the 25-year-old Pratt has been the source of many questions in recent months.
In November, the The couple -- who had called off their engagement last year but resumed dating shortly afterwards -- eloped and were "wed" during a 15-minute ceremony with no family present at a chapel at the One & Only Palmilla resort in Cabo San Lucas, Mexico.
However after it occurred, the couple acknowledged the Mexican ceremony -- which was allegedly a spur of the moment decision -- was not legally binding in the United States.
Shortly thereafter, Pratt and Montag supposedly planned to rectify the situation with a Los Angeles Superior Court civil ceremony, however the event -- which aired on The Hills fourth season finale but was later revealed to have filmed after regular court hours and set to be conducted by a non-Los Angeles Superior Court judge -- was called off when Pratt's sister allegedly convinced him that Montag deserved a traditional wedding.
DISCUSS AND COMMENT ON THIS STORY Reality TV World now offers Facebook Comments on our stories. To post a comment, log into Facebook and then 'Add' your comment. To report spam or abuse, click the 'X' in the upper right corner of the comment box. Get more Reality TV World! Follow us on Twitter, like us on Facebook or add our RSS feed.