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Jesy Nelson has sparked further concern this week after pulling out of two big Little Mix events with ill health.
The talented 29-year-old singer is feared to have secretly quit the group by worried fans who received their copies of the band's new album missing her signature.
While Perrie Edwards, Leigh-Anne Pinnock and Jade Thirlwall had all signed the special copies of Confessi, Jesy's distinctive handwriting had been left off the cover.
One wrote on Twitter : "I wonder when we're gonna be told Jesy has left @LittleMix, no EMA performance, no the search final & no #confetti virtual party."
Jesy has sparked more concern after fans said she seemed 'over it'
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Another wondered: "So the rumors about Jesy and @LittleMix are true? She left the band?"
But others were quick to point out Jesy has recently been unwell, so may not have been with her bandmates during the signing session.
Some fans were less worried about Jesy potentially leaving Little Mix than they were about getting what they'd paid for.
"Just given my sister her signed vinyl and it's missing Jesy's signature, idk what their team can do but any help would be appreciated," tweeted one.
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Another said: "I received my signed #Confetti cd, but it is missing jesy her signature :(((
And a third wrote: "Recieved the signed edition album today #Confetti#birthdaygift but seems to be missing Jesy's signature. Has anyone else had this happen?"
Little Mix's rep told Mirror Online: "We're not making any further comment on Jesy currently for private medical reasons."
It comes after Jesy pulled out of last Friday's Little Mix: The Search final after falling ill.
She also turned down Sunday's MTV EMA, leaving her three co-stars to host the virtual event instead.
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Jesy was feeling too unwell to host the final episode of Little Mix: The Search and the EMA last week
Last week fans thought Jesy looked "over it" in a since-deleted Little Mix video promoting their sixth studio album.
While Leigh-Anne, Jade and Perrie were full of beans speaking about Confetti, Jesy was seen rolling her eyes and looking downbeat.
Just hours after the video vanished from the band's socials, a Little Mix rep said: "Jesy is unwell and will not be appearing on tonight's final of Little Mix The Search.
"She will also not be hosting or performing at tomorrow's MTV EMAs."
No further information was given about Jesy's condition.