It's been said that the foundation of any successful relationship is trust -- an important lesson for Chrissy Teigen and John Legend as their wedding day approaches. And while we have no doubt Teigen trusts her soon-to-be-husband, she couldn't help but test him during the shooting of a music video for his single Who Do We Think We Are last May. SwimDaily followed Chrissy as she donned several disguises to spy on her fiancee. John quickly caught onto the plan but the couple had a good laugh when it was all said and done. And as these photos demonstrate, the two make a great couple.