The 25 year-old plays the role of Blair Waldorf in the hit US show and admitted she likes to try to remain anonymous while out and about.
She said to UK's Glamour magazine: 'I hardly get recognised when I go out - it's not as if I wear a headband and pearls on a daily basis!
'I enjoy playing around with my make-up for red-carpet events. I love a strong lip or a smokey eye.'
The star also revealed how she keeps her body in such good shape.
She said: 'I do occasional juicing to clear up my system, but generally I just eat sensibly. Though when I'm staying in a hotel, forget it - I just have to order everything! For exercise, I do yoga.'