Roberts's bosses have allowed her to go back to her old role after taking extended leave to travel with the American star, including a trip to Las Vegas for Hasselhoff's 59th birthday.
According to the Daily Mail, Roberts is hoping to pursue a career in modelling, but for now is earning around £7 an hour in her current job.
"I want to leave [Debenhams] but I want some modelling jobs to earn my own money," said Roberts.
She continued: "It was amazing being on holiday with David - but it is back to reality now. It is fun travelling the world but I've missed some of my workmates in Debenhams too."
Roberts also laughed off rumours about her getting engaged to twice-married Hasselhoff, saying: "Who knows what the future will bring?"
The pair have reportedly moved in together in a £1.2 million house in Lisvane on the outskirts of Cardiff.
Their relationship first became public back in April, after the couple had been dating for three months.