She’s set to return to the stage with her bandmates Mel B, Emma Bunton and Mel C in June.
And Geri Horner has reportedly hired a singing instructor to ensure her vocals are ‘up to standard’ ahead of the hotly-anticipated Spice Girls reunion tour.
According to The Sun, the singer, 46, is said to have taken extra steps in order to achieve the perfect pitch as she ‘doesn’t want to be humiliated’ during her string of performances.
A source told the publication: ‘Geri is anxious to make sure she is up to standard when the girls get back together — she doesn’t want to be humiliated, so she has hired a singing instructor.
‘The girls are all aware the scrutiny is going to be pretty intense, but Geri is the only one who has gone to these lengths.
‘She doesn’t want to be the one people point the finger at if it isn’t note perfect’, the insider added.
MailOnline has contacted Geri and Spice Girls’ representatives for further comment.
Last week, Geri’s bandmate Mel, 43, said the pair had previously slept together during filming of Piers Morgan’s Life Stories.
While the episode is set to air later this year, host Piers, 53, aired a clip of the bombshell moment on Good Morning Britain on Monday.
In the clip, Piers is seen asking Mel: ‘You were coming here to be brutally honest – did or didn’t you sleep with Geri Halliwell? Did you sleep with her?’