noun
at the height of one's popularity; at the peak of one's popularity
Describes a person or thing at the very top of public favor. Often used in the pattern 人気絶頂の〜 or 人気絶頂にある.
彼は今、人気絶頂の歌手だ。
He is now a singer at the height of his popularity.
そのバンドは90年代に人気絶頂だった。
That band was at the peak of its popularity in the 90s.