The 17-year-old actress/rocker has come under intense scrutiny for her outspoken opinions and provocative persona, and she has been accused of being a bad role model for her young fans.
Rutherford, who plays Momsen's onscreen step-mum in the hit U.S. drama, reveals she is concerned about the way the young star conducts herself - but insists she doesn't feel qualified to offer her help to her young colleagues.
She tells Britain's Grazia magazine, "I do worry about Taylor, but I also think she's smart and knows what she's doing. Like Lady Gaga has her persona, I am sure there is an element of persona to it with Taylor.
"I don't dispense advice - they don't ask me for it and I don't think it's my place. Lord knows, I haven't got it all figured out myself yet either."