Kristen Stewart has reportedly praised her "perfect upbringing" for helping her stay grounded.

The Twilight actress - who is currently promoting the vampire franchise in Sydney - told British Elle that her family were the reason she remained down-to-earth.

"My family are amazing. I had like, the perfect upbringing. It sucks for people like Lindsay [Lohan], but it's not her fault that she's so off the rails," she is quoted as saying.

She also told the magazine that it "really bothers" her when the press depict her as ungrateful or nonchalant about her success, insisting that "could not be further from the truth".

The 20-year-old has reportedly faced criticism while on the promotional trip to Australia because of her apparent dislike for the photographers who follow her and co-star Taylor Lautner's (Jacob Black) every move.

The castmates were recently seen taking a jet boat ride together in Sydney.