'Soy' milks demo shift.(Soy tu duena)

Two of the biggest stars of the fall TV season are Mexican thesps Fernando Colunga and Lucero.

Colunga and the single-named Lucero are the stars of "Soy tu duena," which is the most-watched telenovela on Univision in nearly 20 years.

"Soy tu duena" is a bona fide sensation, regularly popping up among the top 10 shows in any language among adults 18-49 and top five with adults 18-34.

The telenovela is a big part of the double-digit ratings growth Univision has seen this year, in sharp contrast to the perf of the Big Four English-lingo nets. Univision's surge in young adult viewers is a sign of the nation's rapidly expanding Latino population, and network execs happily see it as a harbinger of growth trends to come.

Notably, "Soy tu duena"--which means "I'm Your Owner" but is translated into English for marketing and possible remake purposes as "A Woman of Steel" --is delivering more adults 18-34 viewers than any new English-language drama on the nets. …