As summer months and sizzling temperatures approach, the Ministry is always excited to mark the shift in party life: Around this time of year, the good partying moves from nighttime to daytime. The opening salvo of the pool party season came last weekend when New York nightlife institution Marquee opened the doors to its day club in Las Vegas. Victoria's Secret model Alessandra Ambrosio, in a pool-appropriate slip dress, was on hand to unveil the luxurious space. The club, designed by David Rockwell, has eight private cabanas with infinity-edge dipping pools, an open-air deck, dedicated space for games and bars aplenty. Expectant mom Selma Blair popped in, as did Adrien Brody, newly single Justin Bartha, Taye Diggs and Jamie-Lynn Sigler. The space will be open daily throughout the summer from 10 a.m. to 6 p.m. at celeb haven the Cosmopolitan of Las Vegas.