Celeb Spotter: Nick Jonas surprises fans in London & more

London fans went wild when Nick Jonas, 22, made a surprise appearance at Westfield London Shopping Centre on Friday.

No one touch me I'm not okay we just saw @nickjonaspic.twitter.com/1zoDSzHJy5

- Holly (@demxswarrior) April 10, 2015

The "Jealous" singer rocked out after calling on fans via Twitter just a few moments before.

Check out more celeb sightings in the gallery above.

More on AOL.com
Jay Z shares wedding video for 7th anniversary with Beyoncé
Julia Louis-Dreyfus laughs at Walk of Fame star misspelling
Alyssa Milano goes off on airport for confiscating her breast milk
Blake Lively's 'Traveling Pants' co-stars are her baby's godmothers!