Usain Bolt’s sweet birthday message to partner Kasi

Usain Bolt with Kasi Bennett. Pic/Bolt’s Instagram

Jamaican sprint legend Usain Bolt penned a lovely birthday message to partner Kasi Bennett, who turned 35 on Tuesday.

The eight-time Olympic gold medallist Instagrammed a series of pictures of the couple to his 13.9 million followers and captioned it: "Happy Birthday to the most wonderful woman in the world, [who is] a great partner and a great mother. I know the future only holds happiness and prosperity for you. You are God's blessing and I'm happy to be in your life."

The pair reportedly began dating in 2013 and are parents to twin sons, Thunder and Leo (five), and daughter, Olympia (six).