During the seven-day trial, Perry testified that she'd never heard \"Joyful Noise\" before.

The plaintiffs, however, argued that Perry's parents are both pastors and she started her career as a Christian pop singer, which may have made it more likely that she had heard Gray's song.

\"My clients feel vindicated, they feel that they received justice,\" Kahn told ABC News. \"They are not gloating over this, they are deeply religious people, Christian gospel musicians. They felt that they had been wronged, that something of value had been taken without their permission, and they wanted justice and felt that they received justice.\"

\"PHOTO:
Rich Fury/Getty Images
PHOTO: Katy Perry attends 102.7 KIIS FM's 2017 Wango Tango at StubHub Center, May 13, 2017, in Carson, Calif.
>

Perry countered that she was \"mostly always listening to ... secular music anyway,\" even during the early part of her career as a Christian singer.

Perry's collaborators on \"Dark Horse,\" including Dr. Luke, Max Martin and Juicy J, were also found liable on Monday, Billboard reports.

Kahn told ABC News he expects Perry's lawyers to appeal the decision.

ABC News' Christopher Watson contributed to this report.

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