Pop superstar Lady Gaga clearly has good taste when it comes to start-up investing. In June, the Born This Way singer was part of a team including Google ( GOOG) Executive Chairman Eric Schmidt to raise $1 million for social network Backplane. Started by Lady Gaga's manager Troy Carter, Backplane is still in stealth mode but hopes to create an interactive platform for brands centered around specific interests, like sports and entertainment. Gaga holds a 20% stake in the company. While BackPlane is Gaga's first start-up investment, it's not her only foray into the tech space. Last year, she worked with social games company Zynga to create GagaVille, an offshoot of its FarmVille game, in which users try to win virtual items like unicorns and crystals. She's also collaborated with flash sales site Gilt Groupe for a charity auction and has worked with Google and Polaroid.