The couple, who split in August after news broke that the celebrity baker had had an affair with his American Baking Competition co-star Marcela Valladolid, are currently on a festive skiing break with family.
"Happy Christmas All!" Alexandra captioned a photo of herself with Paul.
Throughout their Alpine holiday, Paul, Alexandra and their 12-year-old son Joshua have been enjoying plenty of snow and warming winter food.
"Beautiful Alpine view," posted Paul on Instagram with a picture of the ski resort covered in snow. "Pud was good tonight praline chocolate with saffron cream."
"Warm croissants - for medicinal purposes of course," wrote Alexandra with a snapshot of some pastries. "I need some help to get going today !🎅🍷."
Paul, 47, and 49-year-old Alexandra recently began rekindling their relationship and were spotted sharing a loving kiss following a meal at a pub in early December.
In the months following news of his affair Paul spoke out, calling it the "biggest mistake" of his life and saying he wanted to get his marriage back on track.
"We are talking," he said in October. "We are working to get back together again but it's going to take time."