The Canadian singer canceled her performances last year to focus on her husband, Rene, their family and associated health issues. Her husband had a cancerous tumor removed in December 2013.
Dion performs at the Colosseum at Caesars Palace through Jan. 17, 2016, giving fans a new show directed by Ken Ehrlich, who produces the Grammy Awards.
Those giant swells in her songs showed no signs of letting up as she powered through her hits such as "The Power of Love," "Beauty and the Beast," "A New Day Has Come" and her show-stopping finale, "My Heart Will Go On."
She even brought some classics from Prince, Queen, Judy Garland and the Bee Gees to the 4,300-seat theater, as well as duets with Frank Sinatra and Elvis Presley, both in hologram form, and a duet with herself.
Dion ran through a 23-song set that started nearly 40 minutes late, leaving an impatient crowd chanting her name. When the red curtain rose, Dion emerged alone on the stage, then with a 24-member orchestra and three backup singers accompanying her. The star showed off new costumes from Atelier Versace, Schiaparelli, Elie Saab and Thierry Mugler, many of them long gowns with high slits.
This marks Dion's 12th year performing in Las Vegas.
Tickets start at $55. Tickets: Colosseum at Caesars Palace box office, (866) 320-9763