NBC's legendary sitcom "Friends" was no stranger to A-list guest stars. One of its most notable was Reese Witherspoon, who played Jill Green, the youngest sister of Rachel Green (Jennifer Aniston).

Just when you think you know someone. Jennifer Aniston was floored when she discovered longtime friend and “Morning Show” co-star Reese Witherspoon’s actual name. The a-ha moment took place while the ...

Add Yahoo as a preferred source to see more of our stories on Google. From left, Chandler Bing (Matthew Perry), Jill Green (Reese Witherspoon), and Rachel Green (Jennifer Aniston) stand in the main ...

From left, Chandler Bing (Matthew Perry), Jill Green (Reese Witherspoon), and Rachel Green (Jennifer Aniston) stand in the main kitchen on "Friends" - Dave J Hogan/Getty Images NBC's legendary sitcom ...