Not sure about the designer but this dress looks good.
Lehenga just the color combo and design
Pakistani wedding's are more influenced by India rather than the middle-east like most things in the tradition. Pakistani wedding's consist of 5 days and the bride wears colorful beautiful embroidered clothing. Saudi Arabian wedding's are like western weddings and the dresses can range from traditional Arab clothing to a white dress.
Ritu Kumar's design - very detailed piece - http://couturerani.com/products/ritu-kumar/ritu-kumar-shimmering-georgette-churidar/