Celeb Spin reports: The 29-year-old pop star’s assistant tweeted the photo with the comment, “Look who’s rehearsing on her own in the corner… too cute!!!! #CapitalJBB”
Intently hitting all her marks, the “Call My Name” singer wore a black tracksuit jacket with matching pants, and fluorescent yellow sneakers with her hair pulled up.
Also performing at the two-day Jingle Bell Ball are One Direction, JLS, Rizzle Kicks, Lawson, Little Mix, The Script, Bruno Mars, The Wanted, Rita Ora, Example, Calvin Harris, and Pink.
Photo Credit: Twitter
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