If you're wondering how "Spider-Man" hero Tobey Maguire unwinds in his free time, look no further than Miami's upscale Aventura Mall, where the star of the summer showed up Thursday night to support a store launch by the clothier Express, reports PEOPLE. Looking relaxed in jeans and a T-shirt, and sporting a Brad Pitt-like spurt of facial hair on his chin, Maguire, 27, and his entourage partied to the beat of the music blaring out of the store's "Denim Bar." Actor Wilmer Valderrama, 22, from TV's "That '70's Show," enjoyed a retail moment and opted to sample the men's jeans, as did MTV's Brian McFadden, who showed up with girlfriend Nicky Hilton, who, in turn, arrived at the soiree with her sister, Paris, and the sibling's model boyfriend, Jason Shaw. The party lasted until way past midnight, when the last of the blue martinis had been downed. And while some guests left with a copy of "Genius," a new book celebrating the art of denim, or even a new pair of jeans, one happy young lady left with something more. "What an amazing night," she shrieked to a friend. "I have Tobey Maguire's used napkin!"