In case you forgot, Kardashian once dated and famously made a sex tape with Brandy's brother, Ray J, and then later was sued by the singer's mother, Sonja Norwood, for credit card abuse in 2008 (the suit also named Kim's siblings Kourtney, Khloe and Rob Kardashian, as well as matriarch Kris Jenner) and they lost and had to pay back Sonja.
Brandy herself has said in several interviews that she dislikes Kim, so watching them both in a movie will be interesting.