There’s fresh buzz of a romance between Pussycat Doll Nicole Scherzinger and her “Dancing With the Stars” partner, Derek Hough. An on-set spy told us this week, “He would grab her hand as soon as they walked offstage, and they were all smiles and whispers during ad breaks. Derek was constantly rubbing her back away from the cameras.” Nicole, who’s dating race-car driver Lewis Hamilton, has strongly denied the rumors and tweeted earlier in the series, “Derek is like a little brother 2 me. Everyone knows how in luv & committed I am 2 Lewis!”