Rihanna certainly pissed off many of her fans who attended her concert in Birmingham, England recently.  She was spotted out on Sunday night partying with model Cara Delevigne in London -- the day before she was scheduled to perform at 8 p.m. in Birmingham. Delevigne was allegedly spotted with "white powder" smeared across her lap when she exited the club.  

Rihanna apparently partied until around 3 a.m., which resulted in her showing up to her performance 2 hours late and she didn't end up taking the stage until around 10:30 p.m.  Her fans were not happy and expressed their disappointment at her lack of punctuality on Twitter.

Check out the angry fan tweets above.

Source: bossip.com