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! "I remember as a kid we would watch the game but have really no idea what was going on and then everyone would be silent during the commercials to see exactly like who was in, what was going on, how funny they were," Kim said. "So the commercials are such a big deal during the Super Bowl and I'm just so proud to be a part of it." Watch the clip to see Kim react to her "Dopest on the Ropest" throwback video that went viral last year.