Supermodel and actress Kim Kardashian has passed 5 million Twitter followers on her @KimKardashian account. She reached the milestone this past Monday while she was glued to her laptop. “I couldn’t believe it when it happened. Its such a mind blowing feeling to know so many of you are out there reading my tweets,” said Kim on her blog. Kim has another reason to celebrate: She and her sister Kourtney just signed on for a new reality series called Kourtney and Kim Take New York, starting January 2011. [Us Magazine]