They may have had a tough year, but John Travolta and Kelly Preston have proved that their love can weather any storm. The couple, who have been married 18 years, spilled their secret for a strong union. “Communication!” John, with his wife by his side, told In Touch when asked about the key to a successful marriage at the New York premiere of his new film, From Paris With Love, on January 28. Years later, Kelly can still happily recall the moment John asked for her hand in Switzerland. “He had gotten the ring and did it at the stroke of midnight. That was very romantic!” she gushed. The big-hearted lovebirds, who will celebrate a sweet Valentine’s Day with chocolate treats, recently assisted the earthquake relief efforts in Haiti. Despite their seemingly perfect partnership, the pair are hardly living a fairy tale — their 16-year-old son, Jett, died suddenly of a seizure in January 2009. Adding to the nightmare, John and Kelly have been dealing with the aftermath of an extortion attempt related to the tragedy.