Context: A special tribute to Simon Cowell was presented in the finale for his final season with the show. Many figures from the show's past, including Paula Abdul, made an appearance.

Question: Who had their final season in the show in season nine?
Answer: Simon Cowell

Question: Why did Paula Abdul appear on the season nine finale of American Idol?
Answer: tribute to Simon Cowell

Question: Who had a special tribute at the finale?
Answer: Simon Cowell

Question: Which former Idol star made an appearance for Cowell's tribute?
Answer: Paula Abdul