Russian President Vladimir Putin has always been extremely secretive about his two daughters, so much so that it's all but impossible to find their recent photos on the Internet.

Now, however, the Kremlin seems to be doing little to stop a fast-spreading story that Putin's younger daughter Ekaterina lives in Moscow and heads a company that's involved in developing a $1.7 billion innovation center.

The only interview given by Putin's daughters — Maria, born in 1985, and Ekaterina (or Katerina, as she is also known), born a year later — was for the 2000 book "First Person," commissioned by Putin's election campaign. Putin described the girls as "very smart" and acknowledged that security concerns were making their lives difficult.