Michelle Williams could miss this weekend's Strictly Come Dancing episodes after taking a tumble in training.
The former Destiny's Child star has damaged her ligaments and will not be able to train again until Thursday.
The singer tweeted that she was "sitting here hoping my ankle gets better for sat nite! *positive, healing thoughts only*"
A show insider said: "It is still touch and go as to whether she will be able to dance on Saturday and the next 48 hours are critical."
Fellow celebrity Tina O'Brien was forced to miss a show earlier in the series when she caught chickenpox.
She was told she could miss one programme but if it was any more than that, bosses said she would have to leave the series.
The same rules will apply to Michelle.