The singer and boyfriend Matt Rutler continue their European vacation at the swanky ski resort of Courchevel
Credit: Richard Young/Startraks

Christina Aguilera celebrated her 30th birthday in the French Alps this weekend with a mix of pleasure and a little business.

Topping off a weeklong jaunt across Europe, the singer and boyfriend Matt Rutler flew on Saturday from Berlin to the posh French ski resort of Courchevel.

There, they immediately headed out in a two-horse-drawn sleigh, with glasses of wine in hand – white for her, red for him – as they took in the chalet sights and views on a ride around the village, an eyewitness tells PEOPLE.

Afterward, they returned to the luxury hotel Le Lana before Christina headed over to Les Caves disco, where she had a special singing engagement – performing a late-night set as the surprise guest at Ukranian industrialist Victor Pinchuk’s 50th birthday party, which also included a special performance of Cirque du Soleil.

It’s been a whirlwind week for the lovebirds, who hit a London nightspot, a Paris strip club and Berlin’s elegant Christmas Market along the way.