Conversation so far:
how did spice girls' girl power become popular?
The phrase itself had also appeared in a few songs by British girl groups and bands since at least 1987.
Was there any songs related to girl power?
notably, it was the name of British pop duo Shampoo's 1996 single and album, later credited by Halliwell as the inspiration for the Spice Girls' mantra.

Question: what other celebrities used that term?
Self-contained rewrite: Aside from the Spice Girls, which other celebrities used the term Girl Power?