Debbie Reynolds surprised fans watching her daughter Carrie Fisher's Broadway play on Tuesday (15Dec09) - by jumping on stage to sing a duet with the star.
The Star Wars actress took her one-woman show, Wishful Drinking, about coming of age in Hollywood, to the New York stage in October (09).
And the star's mum, whose career and marriages are mocked during the performance, was secretly watching in the audience - until she revealed her presence by joining Fisher for a rendition of Happy Days during the finale.