Feeds
The illness can cause shingles when caught by adults, so Bluebell has been flown back to the rest of her family in the UK, according to The Sun.
The girl group feared that the illness may force them to cancel their comeback shows in Vancouver, San Jose, LA and Vegas.
A source commented: "Chicken pox is very contagious and when Geri noticed the spots on Bluebell she panicked and warned the rest of the girls.
"Older people who get chicken pox sometimes develop shingles, which could wipe out the band for weeks.
"And it’s not only them who are at risk. Bluebell has played a lot with Victoria’s sons Cruz and Romeo lately."
