"Max Martin wrote 'Bang Bang,' and Ariana had been played it, I'd been played it, and we both loved it," Jessie J recalled. "We just said, 'Why don't we both do

"Max Martin wrote 'Bang Bang,' and Ariana had been played it, I'd been played it, and we both loved it," Jessie J recalled. "We just said, 'Why don't we both do it?' So Ariana stayed on the second verse, I recorded the first verse, and then Nicki was played it in the studio and was like, 'I've got to jump on this.' We didn't go to her and ask; she wanted to do it."

The 33-year-old "Price Tag" vocalist continued by sharing her excitement upon first hearing Nicki's bars for the song. "I'll never forget: I was in my bedroom in my flat in London, and I got sent the version with Nicki on it," she said. "I just sat at the end of my bed holding my phone, staring at the floor, going, 'How the f--k did I land this?' I literally felt like I'd won a competition."