Barbara Palvin, the model and actress, was involved in various fashion and beauty campaigns.

One of her notable campaigns around the Winter of 2019 was for Philosophy's "Holiday Treat" campaign.

Barbara Palvin has collaborated with Philosophy, a beauty brand known for its skincare and fragrance products, for several campaigns.

The "Holiday Treat" campaign might have featured Barbara Palvin promoting Philosophy's holiday-themed products or collections during that period.

For specific images or details about Barbara Palvin's involvement in the Philosophy "Holiday Treat" campaign for Winter 2019.

I recommend checking the official Philosophy website, their social media channels, or fashion and beauty magazines that often cover such campaigns.

Barbara Palvin's social media accounts might provide insights into her collaborations and campaigns with various brands.