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Margot Robbie made Warner Bros. a ton of cash last year — so they signed her production company to a movie deal, something she and other celebs went out to celebrate.

The actress was among a handful of stars who showed up to Delilah in WeHo Monday night — this on the heels of the big news that her LuckyChap production company had inked a first-look deal with the studio … promising she’ll have another crack at some big movies.

The contract she signed with WB amounts to a multi-year agreement to collaborate on future feature films — this, of course, on the heels of “Barbie,” a bona fide money-maker for them.

To ring in the big news … MR hosted a huge bash, where her fellow A-listers rolled through to congratulate her. Just to name a few … Glen Powell, Michelle Rodriguez, America Ferrera, Rose Byrne, Pierce Brosnan, Steven Yeun, Zooey Deschanel, Jonathan Scott, Shailene Woodley, J.J. Abrams and others.

BTW, Margot’s company — which she heads up alongside her husband, Tom Ackerley, and Josey McNamara — has already produced a number of great films … and has acquired the rights to others.

LuckyChap has been behind movies like “I, Tonya,” ‘Birds of Prey,’ “Promising Young Woman,” “Saltburn” … and even some TV shows too. And yes, they helped produce “Barbie” too.

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On its face, it seems like Margot is following in Brad Pitt and Reese Witherspoon‘s footsteps — namely, big-time actors turning into big-time producers. And so far, she’s killing the game.