The two-time SI cover model graces the cover of the magazine's postseason preview alongside B.J. and Justin Upton.
The photo shoot took place at City Field in September when the Atlanta Braves were in New York to play the Mets.
"The three Uptons got along famously, joking throughout the shoot that they were being long-lost cousins," Sports Illustrated said of the shoot. "Whether the Braves win the World Series remains to be seen but one thing is certain: No team has a better-looking fanbase, thanks to Cousin Kate!"