Ramarni Ball has been treated to lavish dinners, taken to star-studded events and flown halfway across the world in private jets by the boxer, who she met at a £600 meet-and-greet two weeks ago.
The 19-year-old aspiring singer and model is said to be having an 'incredible' time with the boxer, and has posted numerous photos and videos of the pair living it up to her Instagram page.
Her most recent video shows her in attendance at a basketball game at The Staples Centre in Los Angeles, with A-list power couple Beyoncé and Jay Z just yards away from her. The video was captioned: 'Lool J and B'.
However, despite her all-expenses paid two-week trip with the boxing champion, Ramarni's mother insists the pair are not romantically involved – and that her daughter already has a boyfriend.
Mandy Ball said it is 'daft' to think her daughter is dating the 38-year-old boxer, appearing to back up claims that the New Look shop assistant is dating AA car mechanic Andre Brown, also 19.
She said: 'She's only 19 and she's got a boyfriend. I have spoken to her since she landed and she says she is having a whale of a time.
'Floyd asked her if she wanted a holiday in America and why would she refuse. It's the trip of a lifetime.'
Friends said she is also enjoying her time in the States with Mayweather, adding that he has been spoiling her with trips in his private jets and luxury motors and treating her to slap-up dinners.
After news of her trip with the boxer hit headlines, Mr Brown came forward to say he is Ramarni's boyfriend and in full support of her jet-setting trip with the multi-millionaire.
Alongside a picture of the pair driving together, he posted a message on Facebook which said: 'They must not know the sketch. You have my love and support.'
But, despite Mr Brown's comments, some family members are still claiming Ramarni could be in the throes of a sudden romance.
Speaking to MailOnline, her cousin claimed she has not had a boyfriend for around a year.
Mackayla Francis said that Ramarni told them about the budding relationship as long as three weeks ago when they last spoke.
The 18-year-old said: 'I've known her all my life and she's a really bubbly girl but I was quite startled when she sent me videos and pictures of her and Mayweather together.
'She said the other day they were going to go to the movies but they couldn't because of all the paparazzi snapping them.
'They look like such a nice couple - if they have babies they'll be so beautiful.'
Source: Daily Mail