Taylor Swift's 1989 world tour is on track to become her highest-grossing ever after reaching the $130 million mark in ticket sales,

According to Billboard Boxscore, it has grossed just $20m less than the final box office tally from the singer's 15-month Red tour, which ended last summer.

The 1989 tour still has four months to go before ending in Austrlia on December 12.

To date, the tour has reported 1.1 million tickets sold tickets from 37 performancesup until the end ...