The 47-year-old singer surprised a Las Vegas crowd to a cover of the British beauty's smashing hit, reported Ace Showbiz.
"So tonight, if I may, I would like Adele to be part of our New Year's Eve," said Dion before jokingly adding, "So don't panic, she's not in the building... Do we need to change the battery in my microphone? It kind of lost it a bit. Adele, hello? Hello?"
"Hello" is currently spending its ninth consecutive weeks at No 1 on Billboard Hot 100. Its parent album "25" recently became the first to sell more than 1 million copies in three different weeks.