Famed Los Angeles attorney Mark Geragos will have to face a defamation suit over his Twitter posts implying that record producer Dr. Luke raped Lady Gaga.

Geragos, known for his public commentary on CNN and roster of celebrity clients, has represented singer Kesha Sebert in litigation against Dr. Luke, claiming he sexually assaulted her when she first moved to Los Angeles as a budding star. Dr. Luke, whose real name is Lukasz Gottwald, has fought back with defamation suits accusing Kesha, her mother, Geragos and his L.A. law firm, Geragos & Geragos, of engaging in a public smear campaign against him.