The singer, who took the number one spot with the collaboration with Eminem, said that she initially dismissed the idea of doing another one on her new album Loud.
She told MTV, 'When I first heard the idea about doing a part two, I was just completely against it. I just felt like you couldn't beat the original. There's no way you can outdo that, so why compete with it?'
But when she heard the track, the 22-year-old Umbrella star said she fell head over heels in love with it.
She added, 'We heard a broken-down version that was stripped down, just piano. I fell in love with it. We recorded it, then we did another version to the stripped-down version with drums, then we did another version with drums and Eminem.
'And then that was the one that just felt really good. I love both. I love the broken-down version, as well as the new one with Eminem.'