LOS ANGELES, CALIFORNIA - SEPTEMBER 21: Brad Pitt gives the thumbs up as he arrives to the Center Theatre Group's "A Play Is a Poem" Opening Night Performance at Mark Taper Forum on September 21, 2019 in Los Angeles, California. (Photo by David Livingston/Getty Images)

In San Diego, California apparently.  She could have joined him for the premiere in L.A. 3 days earlier.

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What an honor! Jane Pitt chose to watch her son Brad’s movie at THE LOT! 🌟 Get your tickets to see AD ASTRA now 🎥🍿 . . . . . #sharethelot #thelotlajolla #thelot #thelotfashionisland #thelotcitycenter #thelotlibertystation #cinema #movies #adastra #moviepremiere #bradpitt #goodtimes #sandiego

A post shared by THE LOT (@the_lot_) on Sep 21, 2019 at 4:33pm PDT

Thanks jordon932002