Brad Pitt under pressure to marry

London: Brad Pitt and Angelina Jolie's six children are putting on the heat for them to get married.

The Hollywood couple have been together since 2005 and raise six children - Maddox, 10, Pax, seven, Zahara, six, Shiloh, five, and three-year-old twins Knox and Vivienne, reports femalefirst.co.uk.

"The kids are putting on the heat. They really are," he said.

However, Pitt, 47, and Jolie, 36, have always maintained they would not wed until gay marriage is made legal throughout US.