Much like a kid entering the fourth grade, Abbott Elementary is growing in season 4 with many fresh faces — and Quinta Brunson tells Us she can't wait for fans to meet the show’s new characters. Among the newbies on the ABC sitcom will be family members of the teachers at Abbott.

On Instagram, Quinta Brunson appeared to tease a crossover episode between the two Philly-centered sitcoms. And Philly is here for it.

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Abbott Elementary Season 4 is right around the corner, and Quinta Brunson is teasing the highly-anticipated crossover. The Abbott creator and star teased at San Diego Comic-Con over the summer that the sitcom will be doing an "interesting crossover" in the upcoming season and it would "change television as we know it.

The ABC series will crossover with FX’s It’s Always Sunny in Philadelphia for Season 4. Rob McElhenney, Danny Devito and Charlie Day will appear in the episode, as confirmed by a photo posted on social media Thursday.

The rumored "Abbott Elementary" and "It's Always Sunny in Philadelphia" crossover episode appears to be happening

Abbott Elementary” star and creator, Quinta Brunson, and “It’s Always Sunny in Philadelphia” star and co-creator. Rob McElhenney, both shared news they’re collaborating on a crossover episode on social media.

Philadelphia-based shows "Abbot Elementary" and "It's Always Sunny in Philadelphia" teased a crossover episode on social media.

The actor gave fans a glimpse at the crossover event on social media with photos showing cast members from the two shows on the 'Abbott Elementary' set