Brad Pitt and Angelina Jolie, who have been together six years, have reportedly finally decided to tie the knot,the couple plans to wed within the next couple months.Pitt and Jolie have long said that they didn't want to marry until marriage was available for every couple. .But it may have more to do with their children, who Pitt told in May "ask about marriage. It's meaning more and more to them. So it's something we've got to look at."The couple has six children together,three adopted and three biological- Maddox, 9, Pax, 7, Zahara, 6, Shiloh, 5, and twins Vivienne and Knox, 3.One source also says don't expect a huge gala from Pitt, 47, and Jolie, 36. The couple's nuptials "would be intimate and informal.