Little Mix singer Leigh-Anne Pinnock has spoken out and thanked staff at a Waitrose store in Sunningdale, after she was "verbally abused" by a male customer during a random altercation which left her "shocked" and "taken back".Recalling the moment, Leigh-Anne, who recently announced her engagement to footballer Andre Gray, took to Little Mix's official Twitter account, where she thanked supermarket staff for running to her defence and showing "great kindness and care".She wrote, "So yesterday I