Reba McEntire has shared a celebratory post in support of her friend following her shock health announcement over the weekend.MORE: Country singer Reba McEntire shocks fans with devastating health updateThe country superstar revealed that she and her boyfriend Rex Linn had both contracted Covid despite having the vaccination.However, on Sunday, the singer took to Twitter to share a far more positive post as she celebrated Today star Hoda Kotb's birthday. VIDEO: Reba McEntire reveals how she met