As part of Time Warp week, past housemates including Pete Bennett, Charley Uchea, Craig Phillips, Dexter Koh, Victor Ebuwa, Alex Sibley, Grace Adams-Short and Kathreya Kasisopa made a shock return.
The former stars burst into the main house during the shopping task and began to party. However, the housemates couldn't react to their special visitors, as they had to stay frozen.
Pete, who won the seventh series of Big Brother in 2006, wasted no time in going over to his former flame Nikki Grahame.
He told her: "Surprise Nikki! How you doing? I'm back! Nice to see you man! Not going to say hello? It's Nick isn't it? You, you've found another man, haven't you! This is where we first kissed. It's just like old times."
Last Friday, former 'legends' Nikki, Brian Belo and Helen Wood entered the Big Brother house, spending 48 hours in a bunker before going in the main house.
Catch Big Brother tonight on Channel 5 at 9pm.
For exclusive competitions and amazing prizes visit Reveal's Facebook page NOW!