“Dancing with the Stars” star Mya narrowly averted a wardrobe malfunction last weekend at the Mirage in Vegas. The singer’s dress split down the left side while she was changing to prepare for the casino’s 20th anniversary party at Jet nightclub, prompting her to close the tear with a batch of safety pins and staples. “She was trying really hard only to be photographed from the right,” laughs our source. Also in the house for the weekend-long party were Benicio Del Toro, Tommy Lee, Courtney Love and Slash.