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Carrie Fisher returned to the hospital for her bipolar disorder following a bizarre performance aboard a cruise ship this past weekend.

"There was a medical incident related to Carrie Fisher's bipolar disorder," her rep said in a statement to ABCNews.com. "She went to the hospital briefly to adjust her medication and is feeling much better now."

Her rep did not respond immediately to ABCNews.com's request for comment.

The former "Star Wars" princess was the secret celebrity headliner aboard the Holland American Caribbean cruise liner the Eurodam Saturday.

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A YouTube video of her performance showed her rambling, at times incoherently, on stage, slurring off-key through a couple songs, and mopping up the stage after her dog went potty.

The actress-turned-screenwriter-turned-performance-artist went public with her bipolar disorder and her struggles with prescription drugs in her 2008 memoir "Wishful Drinking." She later turned the book into a successful one-woman show.