Pop star Madonna has agreed to appear in the TV comedy Extras. This will be the last episode of the Ricky Gervais. Gervais and his partner Stephen Merchant have planned to end the series this year. A list of stars has already marked their presence in the TV comedy show Extras. Few stars to mention are David Bowie, Robert De Niro, and Chris Martin. Gervais and Merchant wanted to end the show with...