Kourtney Kardashian has followed in the footsteps of her younger sister Kim Kardashian by lightening up her locks, which she debuted in Hollywood on Wednesday. PHOTOS: More big-time hair switch-ups in Hollywood The pregnant Kourtney and Kim Take New York star, who is known for her dark, practically black hair, sported a fresh glossy brown color that appeared shades lighter with several light brown highlights dispersed throughout. PHOTOS: Look back on her pregnancy with Mason Kardashian, 31, is expecting baby number 2 — a girl — with her boyfriend Scott Disick in late spring/early summer

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PIC: Pregnant Kourtney Kardashian Lightens Her Hair