Bad Girl Confirmed ...

The song was made for the soundtrack to the upcoming film "Confessions of a Shopaholic." And who do we have to thank for putting together the high-profile duet? Producer Polow da Don, who has worked with Fergie ("London Bridge"), Ciara ("Promise"), and Usher ("Love in This Club").

I came from a Jerry Bruckheimer meeting after seeing the movie, and they were telling us all the music they needed for all the scenes and the characters," Polow told MTV News of his sit-down with the producer of "Shopaholic." "So that night I went to the studio and I was telling Chris about (the meeting). And he was like, 'Let's get on it.' It was crazy, because Jerry Bruckheimer's dream was to have a song from Rihanna (for the movie), and I delivered Rihanna and Chris Brown in 24 hours. So they were like, 'Wow, that's crazy.' "

In the song, Rihanna talks about her shopping addiction, her penchant for bags and shoes and her not-so-thrifty purchasing habits.

"Need no bargain, need no sale/ I want the best, I dress me well," she sings.

Brown chimes in with a rap about his better half toward the end of the track.

"She's a walking sto', I'm talking about her clothes/ I just pause, I'm in awe, cause she's a fashion show."

"It's crazy, because Chris Brown's energy alone is incredible — he's a high-energy kid," Polow said. "Rihanna has a unique voice, and she's one of the easiest people to work with. When her, Chris and myself were in the room, it's fun. That's when the music isn't work at all. It's all freestyle. Chris comes up with an idea; I come up with one. Rihanna will weigh in. And we build. We actually did a lot more records that hopefully will be coming soon."