Stylish social media influencers, Chloé and Marie-Lou Bartoli posed with the 31-year-old at the lavish soiree.
The mother-of-one revealed in a recent interview that she's planning to tie the knot in 2017.
"It'll be next year. I can't wait."
She added that the proposal took her completely by surprise.
"[Was I expecting it?] Absolutely not. He said to me, 'Miranda, I'm telling you now, this is the first and last time I'm going to kneel down in front of you,' she said.
"I was terribly nervous and emotional, trembling with happiness."
Kerr and Spiegel announced their engagement in August after a year of dating.
The model confirmed the news on Instagram with a black-and-white photo that shows a stunning round-cut rock on her left ring finger. The image also includes a Bitmoji that features two characters: a man crouching down on one knee as he presents a giant engagement ring to a woman who appears thrilled by the contents of the box. The words “Marry Me!” appear at the bottom. “I said yes!!!” Kerr wrote in the caption of her post.