 On January 15 , 2015 , Carey appeared on The Ellen DeGeneres Show to announce that she signed a contract to take up residency at The Colosseum at the Caesars Palace hotel in Las Vegas in May and July 2015 ; it is called Mariah Carey # 1 's . During the interview , Carey confirmed " I 'm going to do my first ever residency in Vegas at Caesars . " " This is a special event for me . And again , I have to hope that the fans will enjoy this cause I 'm gonna be performing , which was kind of inspired by my album # 1 's , and this is now the updated version with eighteen of them . Hopefully other people will enjoy this . I 've never done this before . " The confirmation of Carey 's residency came after Canadian singer Celine Dion announced that she had postponed dates of her residency at Caesars Palace to care for her husband , René Angélil , who is suffering from cancer . Aside from singing " Infinity " at her residency , Carey performed a medley of her 1990 debut single " Vision of Love " followed by " Infinity " at the Billboard Music Awards on May 17 , 2015 ; it was her first performance at the ceremony in seventeen years . Andrew Hampp for Billboard described the performance as " octave @-@ leaping " and one of the most memorable of the night . Other promotional appearances included Jimmy Kimmel Live ! and Live ! with Kelly and Michael . For the latter , Carey wore an Aurora @-@ inspired dress from the Disney film Sleeping Beauty and performed on Main Street , U.S.A. in Disney World . 
