"Everyone go and vote for @JUP_8TL [Justin Upton] for the All Star Game! #keepitinthefamily #VoteJUp," posted the 22-year-old model along with a photo of herself and MLB stars Justin and BJ Upton.
The Other Woman actress posed with both Justin and BJ for a Sports Illustrated spread featuring "The Uptons" in 2013.
"The three Uptons got along famously, joking throughout the shoot that they were being long-lost cousins," Sports Illustrated wrote of the shoot at the time. "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!"
Upton's on-again off-again boyfriend Justin Verlander is also an MLB player and pitches for the Detroit Tigers. The MLB All-Star Game will take place at Target Field in Minneapolis, Minn., on July 15.