Despite rumors that Riff Raff and Katy have went out on a date or two, the outspoken rapper was mum when it came to the pop princess not too long ago. TMZ cameras caught up with Riff Raff and the rapper pleaded the fifth on the topic but did reveal that the two do have a collaboration brewing.

"We have a song coming out." replied the rapper when pressured about Katy. He later added, "Man, I can't disclose all of the information because it's private."

Katy has denied ever having any romantic involvement with Riff Riff.

[TMZ ]