‘Boob job for sure,’ posted one commenter, while another claimed there was ‘no way that it’s a push up bra’.
Others, however, are not convinced the 23-year-old has gone under the knife, with one fan writing, 'When guys don't know how sports bras or bras in general work lol.’
Set to compete in the 200m hurdles, the Olympic debutant says she has no regrets about finding fame through her hip-wiggling start-line ritual.
‘It's been really great for me,’ she told Fox Sports. ‘It's given me a profile in the sport. It can be quite difficult in athletics to make a name for yourself and that helped me do it.'