Christian Louboutin isn't letting a little lawsuit stop his party.

The famous French shoe designer, behind the uber-popular red bottom shoes, is suing fellow French fashion house Yves Saint Laurent and its parent company PPR for trademark infringement in a U.S. federal appeals court, was in London on Monday (April 30) to open a museum exhibition marking his brand's 20th anniversary.

Still, Louboutin took time to address the suit while talking to the Associated Press, stating, "What PPR does via Yves Saint Laurent is breaking my trademark, which I find incredibly offensive," in reference to a YSL shoes that is red all over, including the soles. "I do not own a color. I own a specific color in a specific place."

A lower U.S. court rejected a request by Louboutin to stop the sale of the YSL shoes, but the new panel of judges has yet to issue a decision.

Louboutin shoes are one of the world's most recognizable fashion items, and have been worn by celebrities from Beyoncé to French first lady Carla Bruni.

The exhibition at London's Design Museum traces Louboutin's rise in the shoe game, from a teenager fascinated by cabaret showgirls' costumes to his stints at YSL and Chanel to opening up his first boutique in 1991. It also includes creations designed for a 2008 exhibition with director David Lynch which examines shoes as fetish objects. The retrospective show runs from Tuesday (May 1) to July 9. —Mariel Concepcion (@Mceezy)