Chicago Cubs superstar Kris Bryant is already killing in 2017 ... dude just married his high school sweetheart in a massive Vegas wedding -- packed with teammates and other MLB superstars.
The 25-year-old 3rd baseman swapped "I Dos" with Jessica Delp -- his girlfriend since high school -- at the J.W. Marriott in Sin City.
Some of the guests included Cubs' teammates Anthony Rizzo, Jason Heyward, John Lackey and Justin Grimm. Bryce Harper -- who also grew up in Vegas -- was there, too.
Bryant and Delp got engaged in 2015, he won the World Series and NL MVP in 2016 and is now married in 2017.
Dude's havin' a helluva run!
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