Bolt wrote in the post: "I want to wish my gf @kasi__b a happy birthday. I get to spend ur special day with u. I want nothing but happiness for u & will continue to doing my best keeping a smile on ur face.
"We have started a new chapter together with our daughter Olympia Lightning Bolt."
I want to wish my gf @kasi__b a happy birthday. I get to spend ur special day with u. I want nothing but happiness for u & will continue to doing my best keeping a smile on ur face. We have started a new chapter together with our daughter Olympia Lightning Bolt ⚡️🎉🎊💫 pic.twitter.com/FhlwdaF2Zx
It comes after Kasi herself shared a series of pictures from her personal family photo album last month as she celebrated the sportsman's first Father's Day.
Kasi posted pictures from her ultrasound, her labour and from the trip they conceived their baby on, just eight days after giving birth.
She wrote: "Happy Father's Day to the most amazing man. Our little girl is blessed to call you daddy. We love you more than a single day could convey."
Alongside the second picture of them on a boat, Kasi revealed that this holiday was when they conceived their child.
Usain Bolt and partner Kasi. Photo / Instagram
She wrote: "The trip that gave us our biggest blessing."
Kasi also shared a clip of the couple at their baby's ultrasound as she wrote: "Now a party of three."
