Jayda Cheaves, an American social media influencer and businesswoman, pleaded guilty to before the Western Regional Gun Court in St. James on Wednesday morning.
Cheaves and his associate, Gregory Wright, were fined $500,000 for unlawful weapon possession and $300,000 for illegal ammunition possession.
Michael Hemmings, Cheaves' attorney, stated that his client will pay the penalty.
The two Americans were apprehended on Monday at Sangster International Airport as they prepared to board a private plane. Two weapons and 15 rounds of ammunition were discovered in their luggage by port security personnel.
According to the authorities, Cheaves and Wright have weapons licences in the United States but are not authorized to possess firearms in Jamaica.
Cheaves traveled to Jamaica to celebrate her 24th birthday last week.