Kim explained her decision during her visit last week to the ET set. NEWS: Kim K. Talks Bruce Jenner "Her eyes were closed and we had taken so many pictures and I happened to like that picture of myself, so I cropped her out," Kim told ET. "All my friends were sitting there and we're like 'It's fine, it's fine.' Everyone crops people, and I got so much crap for cropping her out." The move seemed out of character for Kim, who posts so many photos that she's releasing a book of selfie photography called Selfish. The 34-year-old reality star previewed the cover art for the 352-page book earlier this month and has thanked Kanye for "inspiring this idea and helping to design the book" so that she can "share a decade of selfies in an intimate and artistic way." During her family's trip to Thailand last year, Kim admitted to taking 1,200 selfies, but she also has a sense of humor about her selfie obsession, as seen in a new T-Mobile Super Bowl commercial. VIDEO: Watch Kim Kardashian's Sexy, Funny T-Mobile Super Bowl Ad!