Billboard Hot 100 No. 1 Debuts, a Guide
8. Celine Dion
"My Heart Will Go On"
Chart Debut Date: February 28, 1998

Celine Dion knows a thing or two about a massive single -- but the track that surprised fans in her return to Las Vegas on Saturday night wasn't one of her many hits.

Instead, the singer tried her hand at Adele's "Rolling in the Deep" at her show at the Colosseum at Caesars Palace, belting the chart-topping song after telling the crowd, "I love Adele so much. She's amazing."

A bootleg recording of the performance appeared on YouTube on Monday. After canceling several dates earlier in the year, Dion has returned with a full slate of summer performances at the Colosseum, which will run through Aug. 19.

Adele's '21' Going for 24th Week at No. 1 on Billboard 200

For Adele's part, her anthem has helped last year's "21" stake out a long reign at the top of the Billboard 200, with the album expected to notch its 24th non-consecutive week at No. 1 with Wednesday's chart.

Hear Dion's cover below. What do you think of her version?