The toast of a particular place is a person who is very much admired there for something they have recently done

Not so long ago Diana was a little-known actress playing in a provincial theatre - these days she's the toast of New York/the town. 不久以前戴安娜还是一个在地方剧院演出的鲜为人知的演员——而现在她已经成了纽约／城里备受推崇的人物。