LOS ANGELES (Reuters) - Grammy-winning pop singer Pink will release her sixth studio album, "The Truth About Love," on September 18, ending a roughly four-year record drought for her fans. Her label, RCA Records, described "The Truth About Love" as the singer's "unique take on the different shades of love - the dark, the light, the happy and the sad." Pink, 32, is working on the album with producer Greg Kurstin, the man behind the likes of Foster The People and The Shins. ...