Getty Composite

Orlando Bloom and Rachel Lynn Matthews have no chill ... the "Batwoman" star dressed up as Orlando's ex-fiancée, Katy Perry , in a recently shared Halloween pic.

See for yourself ... Rachel donned a black wig and blue spacesuit in a costume resembling the ensemble Katy wore for her voyage into space in April.

Rachel and Orlando -- who dressed as a skeleton -- snapped pics shared on the former's Instagram story ... gettin' real cozy in the photos.

Rachel also kissed the ground a la the "Dark Horse" singer's first act upon landing back on terra firma ... which was roundly mocked on social media. Shutterstock

Orlando and Katy announced their split through their reps back in July after nearly 10 years together ... explaining the stars were focused on co-

See Full Page