Brad Pitt and Angelina Jolie have signed a pre-nuptial agreement after deciding to wed in December, it has been claimed. Angelina reportedly insisted on the agreement to ensure her two adopted children, Maddox and Zahara, will be well looked after if the pair divorced. The Hollywood couple are set to tie the knot at George Clooney's Italian villa on December 1.'Ocean's Eleven' star Brad has agreed a secret deal which means Angelina's Cambodian son, Maddox, four, and nine-month-old African daughter Zahara will never have to worry about money.The handsome star is also planning to adopt more children with Angelina, and is looking forward to having a child of their own.A source told Britain's Grazia magazine: "Brad has always understood that she wanted to adopt more because she has such strong feelings about helping children born into poverty. But she would love to have Brad's baby too"Meanwhile, the beautiful actress reportedly wants to go on television to tell the world about her relationship with Brad.A source said: "Angelina's told Brad it's time they came clean about their relationship on TV She's just looking for the right show to set the record straight"