Create a highly detailed image of an ultra-luxurious modern villa nestled in lush greenery. The villa should exude opulence, designed for wealthy billionaires, featuring sleek, contemporary architecture with large glass windows, clean lines, and expansive open spaces. Surround the villa with a beautifully landscaped garden, showcasing a grand driveway lined with tall, majestic trees. Include a large, sparkling swimming pool with elegant lounge areas nearby, a state-of-the-art tennis court, and a small private helipad discreetly integrated into the landscape. The entire scene should reflect a serene, exclusive, and extravagant lifestyle.