Rihanna may 'Talk That Talk' ... just not fast enough for fans at a London concert this week. The singer faced a harsh reaction from the huge crowd, who was left waiting an hour for Ri to hit the stage at London's O2 arena on Monday night (Nov. 14).

The 'We Found Love' singer, who was due to take the stage at 9PM, elicited boos from the Loud tour concert-goers after forcing them to wait until after 10PM for the show to start.

A source told Britain's The Sun, "Fans weren't happy at all. Especially when she did finally come on stage, her performance was half-hearted." The gig immediately preceded Rihanna's wild night on the town where she reportedly partied with over 20 bottles of alcohol before dishing out unsolicited sex advice to club-goers.

The incident also followed the cancellation of a number of shows on the European leg of Rihanna's tour due to the singer's over-exhaustion and trip to the emergency room. Ri was previously forced to apologize to fans after showing up 90 minutes late to her show in Belfast, Northern Ireland back in September.

Looks like Ri better get her priorities straight before her fans turn on her for good!

Watch 'Rihanna's New Music Video, Art Imitating Life?'

Watch Rihanna's 'We Found Love'
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