Former nursing student Milyn Jensen hooked up with Justin in December last year, after being introduced by his best friend, rapper Lil Twist.
Speaking to The Sun On Sunday, the 22-year old said: 'I was absolutely shocked when I read he had split up with Selena over what we did. I hate being the girl that broke them up.'
Shocked: Milyn Jensen reveals that she hates being the girl who broke up Justin Bieber and Selena Gomez
After buying her 'some large fries' and 'two double cheeseburgers for himself', the 19-year old allegedly drove them to a marijuana store then back to his $4.5 million LA home.
After a quick tour, Bieber allegedly took Jensen to the Beverly Hills Four Seasons hotel, where he had a luxury penthouse suite decked out with 'white roses' for their arrival.
'He offered me a drink... I'd only taken two sips before we started messing around,' Mimi said. 'Suddenly we were kissing and I started to take off my clothes, it was a natural thing.
bad Girl Club: The former nursing student was aked to star in Oxygen's racy reality series because of the tryst
Introduced: Milyn met Justin through his friend, rapper Lil Twist, at a LA nightclub in December 2012
Split: One night with Milyn ended Justin's relationship with Selena, pictured her a few months before the infidelity at a LA Lakers game
Team Selena: The new reality star says she is a big fan of the Spring Breakers actress
'Justin knew what he was doing like a man much older than his years. I felt like he'd had a lesson or two.'
Since then Milyn has been the target of much hate from fans of Gomez and Bieber, including her own 14-year old niece who apparently does not speak to her following the tryst.
But she has benefited from the exposure, dropping out of her nursing course to focus on a reality TV career as the new star of Bad Girls Club: Miami.
And despite sleeping with her ex-boyfriend, Jensen says she is a massive Selena fan, and likes it when people tell her she looks like the Spring Breakers star.
I’m a huge Selena fan and I’m on Team Selena!' Milyn told Hollywoodlife.com. 'She is gorgeous!
'Anyone comparing me to her would be a compliment. I’ve gotten a few based on saying we look alike with our dark hair and skin!'