YouTuber Josh Brueckner proposed to his girlfriend Katie Betzing after his professional boxing debut tonight.

Brueckner beat Tyler Smith by unanimous decision at the Staples Centre and then immediately grabbed the microphone, calling his girlfriend over before getting down on one knee.

Brueckner and his now fiance have a combined Instagram following of more than 800,000 people, and they will soon be sharing the news with them all.

The 24-year-old impressed on his debut, outpointing and outclassing Smith who was resilient but simply had no response to the class of Brueckner.

The fight between the two was only confirmed on Monday of fight week, which left them with no time to prepare - but Brueckner took his moment and admitted he had it planned all along.

"I've always wanted to do this, come here baby."