We always knew he was a stan, they follow each other on Twitter, he said several times he loves her and would like to collab with her + years ago in his bio there was like "listening to Rihanna".
During her BBMA performance:
Quote:
Bruno Mars
Swag the **** out @rihanna!
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She also tweeted him when his mum passed away etc.
I lost my hopes for a collab tho