The Since You've Been Gone hitmaker decided to form the band with her backup singers Jill and Kate, and they've already been in the studio recording music together.
The 29-year-old tweeted: 'I'm off to Oklahoma to record some songs with @jillandkate! I love random writing and recording with friends!'
When asked what made the girls form the group, they replied: 'We've been writing & singing together 4 over 4 years so we thought why not record it. We love singing harmony!'
Clarkson won't be the lead singer in Already Famous - instead they will all share the lead vocals.
They added: 'We switch on different songs. We all sing lead, alto, and soprano at different points.'