LeAnn Rimes says she is “heartbroken” after having to postpone two concerts this week due to “severe illness”. The singer and The Voice UK coach has had to rearrange two performances in the US, in Spokane and Seattle, to 31 May and 2 June respectively. “Due to severe illness, I am unable to travel and perform this week,” she wrote in a post on her Instagram Story. “I’m sorry to share that the upcoming shows in Spokane and Seattle will be rescheduled … also, good news as we will be seeing you very soon… “I am truly heartbroken to have to reschedule and I am so very grateful for your kindness, and continued support as I recover. “I look forward to being back on stage and seeing you very soon. Love, LeAnn.” LeAnn Rimes says she is grateful for her fans’ kindness and ‘continued support’ (Getty) The American singer confirmed all tickets remain valid for the rescheduled dates, and those unable to attend can get a refund.…