Speaking to Today Extra ahead of the luncheon, Jennifer described her headpiece as "so magnificent."
She told the show's hosts: "I'm happy to have it on my head but it will be nice to take it off and look at it too!"
Also in attendance at the luncheon were engaged couple and The Bachelor originals, Anna Heinrich and Tim Robards.
Erin Holland and Emma Freedman also attended the event. Erin wore the Cooper St Dawn Drift Ruffle Dress dress ($189.95; cooperst.com.au) with a Gucci belt and Tony Bianco heels.
Singer George Maple was there to perform, and she wore a white hooded dress with a metallic belt, black sunglasses, black platform heels and a Balenciaga logo shawl.