Conor McGregor one-punch KO'd Jose Aldo in shocking fashion

It took just 13 seconds!

After months of trash-talking Jose Aldo, it took Conor McGregor just one punch to knockout the former UFC featherweight champion.

McGregor won the interim featherweight crown by TKOing Chad Mendes back in July after Aldo pulled out of the original matchup.

Aldo, 25-2, hadn't lost since 2005 and was undefeated in UFC. McGregor, 19-2, hasn't lost since 2010 and is undefeated in UFC.