She knows how to strut on the runway, but supermodel Petra Nemcova could not find her stride Tuesday night when she hosted a soiree on the rooftop of the Gramercy Park Hotel for her Happy Hearts Fund for tsunami survivors. Despite being instructed three times on where to stand, the leggy lass could not manage to stay put. “It’s like she can’t talk without moving,” said one spy. Flummoxed guests included Wyclef Jean, Catherine Zeta-Jones, Michael Douglas and fashion designer ...