Brad Pitt and Angelina Jolie announce about their engagement.

Angelina Jolie, 36, and Brad Pitt, 48, a Hollywood megastar couple since 2005, are engaged, Pitt's representative said Friday, CNN reported.

"Yes, it's confirmed. It is a promise for the future, and their kids are very happy. There's no date set at this time. Brad designed the ring," the representative, Cynthia Pett-Dante, told CNN.

The longtime couple had been insisting that they wouldn't marry unless the nation's laws allowed all couples to marry.

Asked about this position after the engagement announcement, Pitt's representative didn't have an immediate comment.

Jewelry designer Robert Procop of Beverly Hills, California, designed the diamond engagement ring after a yearlong collaboration with Pitt, his representative said.

Pitt "wanted every aspect of it to be perfect, so Robert was able to locate a diamond of the finest quality and cut it to an exact custom size and shape to suite Angelina's hand," the representative said. "Brad was always heavily involved, overseeing every aspect of the creative design evolution. The side diamonds are specially cut to encircle her finger."

The couple has six children, including three biological children together. Pitt adopted two of Jolie's children whom she had earlier adopted from Cambodia and Ethiopia, and they together adopted a boy from Vietnam. Their biological children include twins.