Matt Kent/Getty Images

Country music superstar Taylor Swift is on the receiving end of a multimillion-dollar lawsuit that accuses her of taking a $2.5 million advance fee to perform at a festival in Ottawa, Canada, only to retain the money after the show was scrapped.

The complaint, obtained by E! online and filed in federal court in New York by Florida-based ticketing company Fire USA Inc, accuses the 23-year-old singer of a breach of agreement by refusing to schedule a new performance after the Aug. 11, 2012 concert in Ottawa was cancelled.

"Taylor Swift, individually and/or through her agent [The] Messina [Group], refused to perform and or reschedule a new appearance, as agreed under the Oct. 18, 2011 agreement," read the complaint. "The acts of third-party defendant Taylor Swift and/or her agent Messina amounted to a breach of the aforementioned Oct. 18, 2011 agreement."

Fire USA sued Swift after being sued itself by credit card payment processing company Evo Merchant Services for $1.8 million, according to the complaint. Evo reportedly was on the hook for $1.8 million in canceled credit card billings after customers sought refunds en masse.

A representative of Swift's declined to comment on the lawsuit when contacted by ABC News. An email sent to the public relations firm representing Swift was not immediately returned.