JUST IN: Travis Kelce’s ex Kayla Nicole joins forces with Toni Braxton in a move fans are calling a calculated swipe at the NFL star — and the fallout is shaking both the NFL and music world.

Travis Kelce’s ex-girlfriend Kayla Nicole appeared to make another dig at the NFL star and his romance with fiancee Taylor Swift – but this time, in a very public setting.

Nicole, who dated Kelce on and off for five years, left Swifties furious in October when they were convinced that her Halloween costume was a subtle swipe at the tight …