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Phrase(s): Bless one’s lucky star. [and] Bless one’s stars.
Prov. Be thankful for a lucky thing that happened. (Also Bless my stars!, a mild interjection of surprise.) • I bless my lucky star that I met you, dear. • I was in a car crash yesterday, and I bless my stars that no one was hurt. • Alan: Look, honey! I gave the house a thorough cleaning while you were away. Jane: Bless my stars!
McGrawhill's American Idioms And Phrasal Verbs