Alexandra Burke’s brother has been exposed as a cocaine drug dealer.

18-year-old Aaron Burke allegedly deals narcotics to an A-list clientele on a regular basis.

In a video released by The Sun, an undercover reporter disguised as a buyer, gets Aaron to talk about his dealing tactics.

Aaron discusses using his X Factor winner sister’s fame as a tool to draw in clients,  claiming  “I can get the best stuff – as much as you want. I get it for celebrities I’ve met because of my sister.”

Alexandra Burke apparently has no idea of her brother’s extra-curricular activities and one can only imagine how devastated she will be when she finds out.