The woman who steps out of the limo at the end of the movie, almost walking into the distracted Pierre, is played by Katja Schuurman. She played Katya in the original 2003 Dutch version of the movie by Theo van Gogh.
Katya's wireless microphone rig is clearly visible as a rectangular bulge just below the small of her back in several scenes soon after they go to her apartment.
Right before Pierre asks to use Katya's bathroom, she jumps onto her couch and then fixes her right shoulder strap on the top she is wearing. In the next few scenes, the strap alternates positions.