Though her solo career has yielded no major success in the U.S. yet, former Pussycat Doll Nicole Scherzinger keeps knocking at the door waiting for her solo breakthrough. Her latest attempt, “On The Rocks,” is a mid-to-uptempo number about a break-up served “on the rocks.” The production is slightly dated, which may hamper its chances at radio in the U.S. However, in the U.K., the former “X Factor” judge is coming off a No. 6 hit with “Your Love” earlier this summer. No word on when her Epic Records release will come out in the state.