Heidi Range got choked up during a Sugababes event in Leeds this week.
The singer was in tears as she apologised to fans at a Radio Aire gig.
'We're sorry we can't perform tonight,' said Heidi, 26.
The band are missing fellow member Amelle Berrabah, 25, who is being treated for exhaustion.
New recruit Jade Ewen, 21, was seen giving Heidi a supportive hug.
SEE VIDEO Heidi Range breaks down at fan event...
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