noun
special guest; guest performer
Commonly used in TV, radio, events, and entertainment contexts for a notable invited guest or performer.
今夜の番組にはスペシャルゲストが登場します。
A special guest will appear on tonight's program.
ライブにスペシャルゲストとして有名な歌手が来た。
A famous singer came as a guest performer at the live concert.