Lorde turned 21 yesterday and had a show lined up in her native New Zealand to celebrate.
But she decided to have a bit of fun with her fans and send them on a bit of a treasure hunt.
She put a tweet out with a clue that there would be a "little package" behind a book in the library in Dunedin, the city she was performing in.
<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">DUNEDIN: left a little package in the city library behind this book. see you tonight 🎯 <a href="https://t.co/HwSXfANfLA">pic.twitter.com/HwSXfANfLA</a></p>— Lorde (@lorde) <a href="https://twitter.com/lorde/status/927765719604797440?ref_src=twsrc%5Etfw">November 7, 2017</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
Fans didn't known what what to expect but didn't waste any time trying to find out.
It turned out to be two tickets to the show and a t-shirt designed by Lorde (whose real name is Ella Marija Lani Yelich-O'Connor) herself.
<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr">2 tix & a hand drawing on a t shirt by ella ðŸ˜</p>— Em-J Uson (@EmJUson) <a href="https://twitter.com/EmJUson/status/927850506319310849?ref_src=twsrc%5Etfw">November 7, 2017</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
And the lucky winner was....
<blockquote class="twitter-tweet" data-lang="en"><p lang="en" dir="ltr"><a href="https://twitter.com/lorde?ref_src=twsrc%5Etfw">@lorde</a> I SENT THE TIP TO MY FRIENDS AND THEY GOT IT! THEYRE GONNA SEND ME THE SHIRT ALL THE WAY HERE IN THE PHILIPPINES I LOVE YOU OMG <a href="https://t.co/D9PJVf1u3L">pic.twitter.com/D9PJVf1u3L</a></p>— Em-J Uson (@EmJUson) <a href="https://twitter.com/EmJUson/status/927771147906662400?ref_src=twsrc%5Etfw">November 7, 2017</a></blockquote>
<script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
First, we had Taylor inviting fans round for a preview of Reputation and now, we've got Lorde giving a birthday surprise to some fans.
It's been a pretty good week for popstars being sound.