The wildly successful Tao nightclub at the Venetian has scored an impressive celebrity for its first anniversary weekend: Janet Jackson. Jackson is using the occasion for an album release party for her comeback disc, "20 Y.O."

Interestingly, Jackson has picked the one night where she risks being overshadowed by another diva who knows a thing or two about comebacks: Mariah Carey. After her career suffered a free fall, Carey, back on top, will be doing a concert at the MGM Grand on Saturday night followed by an after-party at Pure nightclub at Caesars — directly across the street from Jackson's party at Tao.