Jermain Defoe sends birthday greetings to 'best mate' Bradley Lowery

The England forward posted a collage of pictures of himself with Bradley on Twitter .

Sunderland striker Jermain Defoe has wished his "best mate" Bradley Lowery a happy sixth birthday.

The terminally ill boy, whose battle with the rare childhood cancer neuroblastoma has touched people around the world, is spending his big day in hospital ahead of a big party later this week, which Defoe will attend.