You saw her at a public event which she'd been booked to appear at? I don't think that counts. Next people will be saying they saw bands at their own gigs.
Celeb spotting action, not really stalking. Gotta catch 'em all! Originally a popular feature of my site popex.com, so mostly from the early 2000s. 99% written by valued punters. Hopefully now with some bonus location content that was lost for a while.