Christina Aguilera set to perform in Australia for the first time in 15 years

Christina Aguilera is seen using a mobility scooter at Disneyland due to 'minor knee injury' while celebrating daughter Summer's ninth birthday

Christina Aguilera Wishes Daughter Summer Rain Happy Birthday in Sweet Tribute: ‘Mommy Loves You So Much’

Christina Aguilera Brings Daughter Summer Onstage To Celebrate 9th Birthday: Rare Photos