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Rihanna and Katy Perry's friendship appears to be on the mend, if it really was broken in the first place.  The pop stars, who were rumored to be on the outs over Perry's disapproval of Chris Brown, exchanged some friendly tweets on Wednesday. 

They came together, ironically, over a video published on TMZ, that showed Ri-Ri at a strip club in Miami.  Rumors were also circulating that Katy was there too, but she corrected the error, asking Rihanna in her tweet if she should "be proud or offended" that she wasn't invited for her wild night out.  Rihanna responded with a joke, saying she'd make it up to her soon.  

The North American leg of Rihanna's "Diamonds" tour comes to an end on May 6th in Boston, before she takes off for the summer in Europe.  

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