三生有幸　

◎ 三生有幸 sānshēng-yǒuxìng

[a stroke of luck;be fortunate in three lifetimes;be lucky indeed to meet with extraordinary fortune;consider oneself most fortunate] 形容極其幸運(yùn)

事有奇緣,曰三生有幸。——《故事成語考·人事》