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Bolt and his partner Kasi Bennett posted pictures of the new arrivals, along with their sister Olympia Lightning Bolt, to their Instagram on Father’s Day.
Saint Leo is the middle name of the sprinter, who holds the 100m and 200m world records.
Bennett captioned one of the pictures: “Happy Father’s Day to my forever love! @usainbolt
“You are the rock of this family and the greatest daddy to our little ones. We love you world without end!”
Bolt took the 100m and 200m Olympic gold medals in the 2008, 2012 and 2016 Games and retired after the 2017 World Championships.
The 34-year-old will also be lacing up his football boots for Soccer Aid, staring alongside reality star Mark Wright TV presenter Ore Oduba and Love Island’s Kem Cetinay for the charity match at Manchester City’s Etihad Stadium in September.