In what is sure to be an early Valentine's Day hot ticket for many fans, the Brit will hit the stage three days before she sings at the Grammys.

But only devotees registered on her website,, can pick up tickets for the surprise show.

The gig, which was announced on Wednesday (10Feb16), will also serve as a warm-up for the Hello singer's upcoming world tour, which begins at the end of the month (29Feb16).