Watch: An Auction Day proposal sends the crowd wild and Shelley Craft joins the show on Season 4 of The Block

This year marks 20 incredible seasons of The Block, and to celebrate we're taking a trip down memory lane in our Around The Block series. You can watch all of the action in the video above.

Ahead of The Block's 2024 season on Phillip Island, join us as we revisit some of the biggest moments, wildest auction results and more across all 20 seasons. Here's a look back at Season 4...

Stream the latest episodes of The Block for free on 9Now.

From the highest of highs to the lowest of lows, Josh and Jenna's Auction Day experience had it all.

As the young couple waited for their auction to transpire, the other Blockheads noticed Josh had "gone white in the face".

But it was more than just the auction nerves getting to him, Josh braced himself as he got down on one knee to ask Jenna to marry him.

Catch the romantic moment in the video above.

There were squeals of excitement and tears as Jenna emotionally accepted Josh's proposal.

"I don't care if I don't win [The Block] anymore, I don't want to win, this is the best present I could ever get," a newly engaged Jenna said through tears.

And it's lucky she felt that way because just a few moments later the couple suffered a blow as their property was passed in at auction and the couple made $0 profit.

AROUND THE BLOCK: Scott Cam makes his debut and the first couple to fail to sell at Auction on Season 3

While Josh and Jenna were still chuffed about being newly engaged, failing to make a profit at auction certainly put a bit of a damper on things. 

"Congratulations and commiserations," one fellow Blockhead said to them. 

Season 4 also welcomed an important member of the Block family – Shelley Craft! 

The much-loved TV presenter first joined the reno show as a challenge master and it's safe to say the Blockheads were excited by Shelley's arrival. 

"My eyes just about popped out of my head, it was Shelley Craft. She's a huge role model of mine," Blockhead Katrina said. 

You can watch Shelley's first Block appearance in the video below.

READ MORE: Everything you need to know about The Block 2024 as first-look trailer is dropped

Join us tomorrow as we take you for a walk down memory lane in Season 5...

Stream every episode ever of The Block for free on 9Now.

The Block Season 20 is coming after the Olympics to Channel 9 and 9Now.