Ronda Rousey vs Holly Holm: Twitter and Instagram reactions from Donald Trump, Lennox Lewis and Lady Gaga

The main event at UFC 193 produced the biggest shock in UFC history

Holly Holm (left) lands a blow on Ronda Rousey (Getty Images)

The sporting world (plus Donald Trump and Lady Gaga) has reacted to Ronda Rousey's shocking defeat to Holly Holm this weekend.

Rousey was soundly beaten by former professional boxer Holm to lose both her unbeaten UFC record and her UFC bantamweight title.

But it was the manner of the defeat that will hurt Rousey the most. Holm bobbing,weaving, and punishing Rousey with her terrific jab before ending the bout early in the second round with a devastating kick to the head.

Holm extended her UFC record to 11-0 after her win.

HERE ARE SOME OF THE BEST REACTIONS

Rousey has since vowed to return to the Octagon, but will take a break first.