WITH A LITTLE HELP FROM MY FRIENDS: Natalia Vodianova not only agreed to walk in Russian designer Ulyana Sergeenko’s debut couture show in Paris on Tuesday, she also brought her boyfriend Antoine Arnault and friend Astrid Muñoz. “I’m very close to her, and every time I go visit her, she has something of [Sergeenko’s] on,” said Muñoz. “I came to Paris just to see it.” The Puerto Rican model is heading to Argentina in September to shoot portraits of veteran tango dancers. “They’re 80 years old now, they’re still dancing tango. I would like to do portraits,” explained Muñoz, who recently started selling prints of her photographs on CoutureLab.com.