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Observe and Report, Seth Rogen, Ray Liotta

Breedo / Deano / Splash News

The Big Easy was all about big star sightings last night as a ton of famous faces converged on the city of New Orleans to shoot a scene for Seth Rogen's directorial debut, The End of the World.

So who all was there? Well, how much time you got?

Among those stepping in front of the camera were Rihanna, Emma Watson, Jonah Hill, Paul Rudd, James Franco, Mindy Kaling, Jason Segel, Aziz Ansari and Michael Cera, who all play themselves in the flick.

"Just leaving set!" Rihanna tweeted. "This has to be one of my favorite moments in life."

Watson, too, couldn't help but share her thoughts.

"Comedy is brutal," the actress told followers via Twitter. "New Orleans is the best!! : ) See you all soon. Em. x."

The End of the World revolves around a number of celebs dealing with the apocalypse while partying at Franco's L.A. home.

Now there's a shindig we wouldn't mind crashing!