The TV personality will join judges Allison Holker and Maksim Chmerkovskiy following sexual assault allegations against Lythgoe.
The 74-year-old TV personality, producer and choreographer is facing a lawsuit launched by high-profile co-host Paula Abdul.
The singer and actor's lawsuit against Nigel Lythgoe is the latest in a string of high-profile cases filed right before portions of California's Sexual Abuse and Cover Up Accountability Act expire.
