FLUFF: Katy Perry, Robert Pattinson, Beyonce and Justin Bieber walk into a festival.

They call it a music festival but really Coachella is just a mating ground for the most famous famous people on the planet. And there happens to be music.

Over the weekend, celebrities flocked to the Coachella valley.

Beyonce made a surprise appearance with her sister Solange, performing the hit Losing You alongside a choreographed dance performance. Queen Bey, 32, made the cameo to a crowd of unsuspecting festival-goers, who all went batshit crazy when she appeared. This cameo doesn’t shock us – now that she’s made surprising people her trademark move (like that time she released an album without telling anyone).

Katy Perry and Robert Pattinson were seen together, so now the world thinks they’re dating. The 29-year-old Roar singer and the 27-year-old Twilight heartthrob were spotted in the crowd at the festival. Is this a new celeb couple to predict? Rob-kat? Kat-bert?

Katy Perry and Robert Pattinson seen together at Coachella.

In more surprise celeb moves, Justin Bieber made a guest appearance in Chance the Rapper’s set. Bieber, 20, joined for two songs, performing their collaboration Confident. Bieber spent the performance wearing a white bucket hat, because he’s that hardcore.

And the final celeb sighting at Coachella was Hilary Duff, who was seen with her not quite ex-husband Mike Comrie. The 26-year-old Lizzie McGuire star was seen with her 33-year-old former partner looking cosy together, however, neither have confirmed whether they are indeed back together. Comrie and Duff announced their separation in January this year; the couple have a two-year-old son. The Coachella sighting comes after recent reports that the couple have called off their divorce.

Despite his greatest efforts to stay anonymous (he tied a scarf around his face and wore it under a cap), someone filmed Leo di Caprio dancing:

Here are all the celebrities descending on the valley to rock out together.

For all the Coachella style, click through this gallery.

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