The former glamour model carried out the attempt at the O2 Academy in Leeds today. In order to achieve the record, she needed to sign more than 1,951 copies of The Comeback Girl - beating the total signed by former world chess champion Anatoly Karpov in 2006.
Writing on Twitter this morning, the 33-year-old admitted that she was "not confident" about her chances. She proceeded to tweet a picture of the sizeable crowd who had gathered for the signing.
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"Wow! That was amazing!! What a shame we didn't quite break the record but we were close," Price said. "Thanks so much to everyone who came along to support me."
Price continued: "It's been a really brilliant day and I loved every minute. My fans really are the best and it was great so many of them came out to try and help me do this. Woohoo! The Comeback Girl is already at number 1!"
Liz Smith from Guinness World Records commented: "Today, Katie has shown real passion and determination in this record attempt, and I have been at her side all day verifying each and every book she signed.
"Unfortunately on this occasion Katie did not successfully achieve a new record, but we hope to welcome her for another record attempt in the future."
Fans who attended the signing have been promised that their names will appear in Price's next novel Santa Baby, which is scheduled for publication in October.