She is represented worldwide by IMG Models in New York. She became an IGN Babe in 2004 and a substitute model on Deal or No Deal for 2006–2007. In July 2007, she appeared on the cover of Maxim's calendar. Her campaigns include Gillette Venus, Olay, Nike, Skullcandy headphones, Gap Factory, XOXO, UGG Australia, Rock and Republic, Billabong, Beach Bunny Swimwear (for whom she was also a fashion week correspondent), and Nine West Fashion Targets Breast Cancer. She has also served as a recurring guest host and contributor on E!, TMZ, MTV, FUSE/MSG, and Extra with Mario Lopez, and has appeared on America's Next Top Model and Watch What Happens Live. In spring 2013, she was host of the reality competition show, Model Employee on VH1. Teigen appeared in the Sports Illustrated swimsuit issue in 2010, and was named "Rookie of the Year". Her friend and fellow model Brooklyn Decker had introduced her to the people at Sports Illustrated to cast her. She was also a part of the 2011, 2012, 2013 and 2014 Sports Illustrated Swimsuit issues. In 2014, she appeared on the 50th anniversary cover of the Sports Illustrated Swimsuit Issue with Nina Agdal and Lily Aldridge.