Video footage surfaced of the performance aboard the Holland America Eurodam showing Carrie slurring off-key songs. Her dog joined her, reportedly urinating and defecating on the stage.
Fisher was featured on the cruise as a "surprise" celebrity guest.
The rep says, "There was a medical incident related to Carrie Fisher’s bipolar disorder. She went to the hospital briefly to adjust her medication and is feeling much better now."
Fisher has publicly discussed her bipolar disorder in the past. Her rep said she "went to the hospital briefly to adjust her medication and is feeling much better now."