The Glee actress took to her website's newsletter to complain about the wet chair, claiming that her seat filler was sweaty.
"The seat filler before me was sweaty… so my chair was wet. Gross!" Paltrow wrote on GOOP.
Earlier this month, Paltrow revealed that she could still return to Glee, claiming that her character - substitute teacher Holly Holliday - is "probably the most fun character [she's] ever gotten to play".
The 38-year-old recently confessed that she loves to inspire people by sharing her personal experiences, saying that she began GOOP in order to help other people.
Paltrow previously said that she is unsure whether she will return to Glee.