Speaking on Sara Cox's BBC Radio 1 show, the 'Young' singer said she was enjoying working with Rowland's replacement Nicole Scherzinger.
"She's lovely. When she's on stage performing, the queen bee just comes out. But on a day-to-day basis she's quite relaxed and quite a reserved character," Contostavlos said.
When asked if she missed Rowland, Contostavlos paused before replying: "No comment." After Cox said she would "take that as a no", Contostavlos did not correct her.
Last week, Contostavlos confirmed an N-Dubz reunion for 2013.