Sophia Bush took to Twitter to show off a behind-the-scenes shot of the cast filming the crossover-with-SVU episode for Chicago PD.

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On Wednesday, Bush posted a photo to Twitter that featured to co-stars from Chicago PD and Law and Order: SVU to highlight the crossover episode to come in the future.

The photo was captioned: "#livingthe #dream @FINALLEVEL: SVU: Behind the scenes,, @TheDanny Pino Hummmm???"

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The photo got over 300 retweets and 1,200 favorites. A lot of fans were impressed with the photo and wanted to see more.

According to On Location Vacations Law and Order: SVU was filming on-location in Staten Island all day on Wednesday.

One Twitter user simply wrote, "cool," in response to the photo.

Another appeared more excited as they wrote, "@sophiabush @FINALLEVEL @TheDannyPino crossover!!!!!!"

Another speculated on what Bush's appearance on the set meant. "Wait so Erin travels alone to NYC," she wrote.

One fan wrote, "ANOTHER CROSSOVER?" which pretty much demanded answers.

One viewer wanted some answers: "Is everyone involved in the crossover this time?"

Another was willing to study to have her questions answered: "if you answer me right now, i'll study chemistry, biology and geography, i promise."

Fans seemed pretty desperate for answers when this vague photo was posted to the social media networking site.