Rihanna performed in Singapore recently. Cara Delevingne and Katy Perry's friend reportedly got high and lip-synced at the Grand Prix concert, prompting her fans to react negatively on Twitter.

According to Hollywood LifeChris Brown's ex-girlfriend left fans disappointed after she was reportedly stoned and not able to sing every song at the F1 event on Sunday.

One fan, Jason Denning posted a message on Twitter with a few choice words for the singer.