#1 to Infinity was a concert residency by American singer-songwriter Mariah Carey at The Colosseum at Caesars Palace in Las Vegas.

The show featured all eighteen of Carey's US number-one singles in chronological order.

[1][2][3] Carey announced the residency during her interview on The Ellen DeGeneres Show.

The announcement follows reports that Canadian singer Celine Dion would not be returning to the venue who postponed her shows so that she could continue to take care of her ill husband.

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.