Athina Onassis made a reappearance at Stéphane Rolland’s show during Barcelona Bridal Week.  The wealthy heiress and only granddaughter of Greek shipping magnate Aristotle Onassis attended the show to support her friend, the French designer, on his debut in Spain.  The renowned equestrian wore a red trouser suit with an asymmetrical cut that left one shoulder bare, paired with black ballet flats.  A life away from the spotlight  Athina Onassis left behind her discreet life away from the spotlight for a few hours and posed for the cameras again in Spain for the fashion show of one of her favourite designers.  The heiress to one of Europe’s great dynasties rarely makes public appearances, so her presence immediately drew all eyes when she arrived on the red carpet accompanied by Pierre Martinez, vice president of Stéphane Rolland.  © de la Calle/GTRES/ShutterstockAthina Onassis looked striking as she emerged at Barcelona Fashion Week With the passage of time – she turned 41 in January – the resemblance to her mother, the late Christina Onassis, who died at 37, …