Kim Petras is open to writing another advertising jingle. The 31-year-old singer has enjoyed big successes in recent years, but Kim wouldn’t be “above” returning to her roots by writing an advertising jingle. The award-winning star – who wrote numerous jingles before she found mainstream success – told the BBC: “Me and my friends still make jingles all the time, just for fun. And if I ever had a stroke of genius and came up with something where I’m like, ‘This has laundry detergent written all over it’, then, for sure, I’m not above it. “And about the money thing: I know what it’s like to stru…