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Rihanna phoned in to Ryan Seacrest‘s LA radio show this morning and finally explained her controversial decision to collaborate with her ex-boyfriend Chris Brown on their recent hit single “Birthday Cake (Remix)” Of course, she’s taken a lot of heat for it, but… she couldn’t care less. Here’s what she had to say:

The first song that came about was ‘Birthday Cake.’ I mean we ended up recording them at the same time and executing them together, but I reached out to him about doing ‘Birthday Cake’ because that’s the only person that really–it made sense to do the record. Just as a musician despite everything else that was going to be the person. You know I thought about rappers, and I’ve done that so many times, and the hottest R&B artist out right now is Chris Brown. So I wanted him on the track, and then in turn he was like ‘Why don’t you do the remix to my track?’ and it was a trade off. We did two records. One for my fans. One for his fans, and that way our fans can come together. There shouldn’t be a divide. You know? It’s music, and it’s innocent.

Well, the fans are eating it up. Birthday Cake is this week’s biggest gainer on the charts, jumping from 17 to 7 since last week. I, personally, didn’t think that the song needed a featured guest. As a matter of fact, if it weren’t for the shock value of the two of them being musically reunited in such a raunchy way… I don’t think anyone would have liked it. Just saying.

Rihanna also talked about creating new music, and her new fashion line (a collaboration with Armani) and more. You can read (or hear) the full interview at KIISFM.