Kylie Minogue is trying to stop Kylie Jenner from using "Kylie" as a trademark in America.
The Australian pop star, 47, has opposed Jenner's US trademark application for the name "Kylie".
Minogue's lawyers KDB have claimed that if Jenner’s application is approved then it would cause confusion between the two Kylies and dilute her brand.
The Keeping up with the Kardashians star, 18, is described by KDB in the legal papers as a "secondary reality television personality" who participates in "photo exhibitionism" and has been criticised by disability rights groups and African-American communities.
The company also cited existing trademark registrations for the term "Kylie" that cover entertainment services and music recordings. It added that Minogue has record sales of more than 80 million.
Minogue - who has won a Grammy and three Brit Awards - also owns trademarks for the terms "Kylie Minogue darling", "Lucky – the Kylie Minogue musical" and "Kylie Minogue".
KDB describe Kylie Mingoue as an "internationally renowned performing artist, humanitarian, and breast cancer activist".
It says she registered her website in 1996 - before Jenner was even born.
Jenner - whose brother-in-law is Kanye West - has been using her own name for a cosmetics line.
The model has nearly 53million followers on Instagram and 15 million followers on Twitter.
The well-connected star is also friends with Justin Bieber, Harry Styles and Willow and Jayden Smith.
Minogue's fans appear to be backing her opposition to the trademark.