Being the total pro she is, she played it off like it was no big deal and continued the show. As it turns out, though, it WAS a big deal and she's been forced to cancel two shows as a result.
The shows were scheduled for tonight (May 1) and Saturday night (May 2) and according to TMZ, the pop star has been advised by her doctors not to perform so that her ankle can heal properly.
Given that she dances her butt off during the show, she definitely wouldn't be able to perform with a twisted ankle. Hopefully skipping these two shows gives her enough time to heal and she'll be feeling better in no time.
Get well soon, Brit!