Katy Perry is giving fans a behind-the-scenes look at how she squeezed into that Ariel costume for Disney Night on American Idol.

The singer dressed up as the Little Mermaid character and the costume was so tight that she could barely move in it.

“some BTS of a lil Sunday sushi,” Katy captioned a series of photos and videos that show her trying to squeeze into the costume.

Katy can be seen getting assistance from hair stylist Rick Henry, makeup artist Michael Anthony, costume designer Heather Picchiottino, wig designer Philmah, and stylist Zoë Heller.

Make sure to check out the moment when Katy fell out of her chair while trying to place her feet (or fins!) on the judges’ table.