Carrie Fisher was recently hospitalized following a bizarre performance on board a Caribbean cruise ship last week. Her reps says the Star Wars actress is being treated for her bipolar disorder.

Video footage of her show surfaced online, showing Fisher, who appeared to be drunk, singing off key while cleaning up after her dog, who did its business on the stage.

But Carrie's rep insists the recovering drug addict -- who was a "surprise celebrity guest" on the cruise -- was not under the influence and that she was acting strangely because of her medical condition. The rep tells TMZ, "She went to the hospital briefly to adjust her medication and is feeling much better now."