Gabby Douglas, the American gymnastics star and all-around gold medalist, finished last among eight contestants in the Olympics individual uneven bars Monday.

Douglas failed to medal in her signature event -- one that had inspired her nickname, the "Flying Squirrel" -- after a wobble on the bars and a step on her landing.

Those key mistakes opened the door for Russia's Aliya Mustafina, who with a 16.133 score added a gold medal to the bronze she won behind Douglas in the all-around competition last week. Mustafina also has a silver medal in the London Olympics from Russia's second-place finish behind the Americans in the team competition.

Coming in second was Kexin He of China, who scored 15.933 points for the silver medal, followed by home country favorite Elizabeth Tweddle with bronze.

Douglas was last up in the competition and needed a score higher than 15.916 to knock Tweddle out of the bronze spot on the podium. When her turn came, she instead turned in her worst routine in her four sessions in London, scoring 14.9.