Olivia Wilde Served Custody Papers by Jason Sudeikis During CinemaCon

Olivia Wilde endured a bit of embarrassment at CinemaCon this week — while she was in the middle of screening the trailer of her new movie — her ex served her legal docs.

The awkward moment was seen by multiple people who were in the room Tuesday when OW was on hand in Vegas to screen a never-before-seen trailer for her erotic thriller flick “Don’t Worry Darling” — which stars her beau Harry Styles and Florence Pugh.

The word is … while Olivia was talking on stage, somebody came up and placed a manila envelope right down next to her at her feet — which was marked ‘Personal and Confidential.’

Olivia was photographed picking it up, taking a peek inside … and then carrying on like nothing had really happened. But something certainly had — according to Deadline, there were court papers in there courtesy of Jason Sudeikis … with whom she shares two children.

The outlet says, citing sources, the docs involve child custody. As you know, they publicly split about a year and some change ago … and since then, she’s been in a whirlwind romance with Harry — whom she also cast in her highly-anticipated film.

It appears that Jason and Olivia were getting along okay in the wake of their split — but this clearly suggests otherwise. You gotta figure Jason wouldn’t just do this to embarrass her if he didn’t have to … so, presumably, he hadn’t been able to get these to her in a normal setting.

In any case, it definitely isn’t pretty — and lends to the idea that … maybe they’re not so copacetic as they put on. Also, this could potentially mean a custody battle is brewing. 😬