19-year-old Billie wore an off-the-shoulder blush-coloured dress, while Lisa, 57, rocked a vibrant red jumpsuit.
Wilkinson's fellow TODAY host also made an appearance on the night with his girlfriend Jasmine Yarbrough.
The couple's attendance is particularly significant as the fashion designer has landed an exclusive deal with David Jones as the giant retailer will stock her footwear line Mara and Mine.