Getty/Instagram CompositeCeline Dion felt the love this weekend ... 'cause a world-class cellist honored her with a rendition of her "Titanic" theme -- and safe to say she's never gonna let go of the memory.
The singer-songwriter attended HAUSER's "Rebel With a Cello" show at Wynn Las Vegas Saturday night ... if you don't know, HAUSER's a prominent cello player from Croatia.
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