United Kingdom, Aug. 23 -- Usain Bolt has got engaged.

The legendary sprinter turned 40 on August 21, and during his birthday celebrations, he popped the question to longterm partner Kasi Bennett - the mother of his children Olympia Lightning, six, and five-year-old twins Thunder and Saint Leo.

Photos shared by the Jamaica Observer on Instagram featured the eight-time Olympic gold medalist, who was wearing a beige checked suit, getting down on one knee while holding a microphone in front of the model.

Another picture showed them embracing after he proposed in front of family and friends at the event.

There was also a shot of Kasi's new five-carat engagement ring, which featured a pear shaped diamond in between several other diamonds....