As soon as I saw the title I assumed Rihanna was saying that Katy is a legend as in you might say your best friend is a 'legend' because they're awesome. I doubt Rihanna actually meant Katy is a legend like Madonna and Michael.
I guess Rihanna's just trying to be nice. Anyways, I'd be so tired of people asking me about Chris Brown if I was Rihanna. Seriously, wasn't that back at 2009? So 2 years ago....
Katy a legend? Even though she's great, I think it's too early to call her a legend, she's just starting. About Chris Brown, I don't see anything wrong with what she said, it's just the truth.