It's the mother of reality TV, launched at the turn of the millennium, and ran for a whopping 19 series before it hung up its boots.
Twenty years on, Big Brother marked the milestone anniversary with a trip back down memory lane, showing old favourite episodes on Big Brother's Best Shows Ever.
The household names we all remember were beamed back on our screens, but what of the names who disappeared into obscurity or dropped off the radar?
It may surprise you to know that of the shows many alumni, it's not just the big names like Alison Hammond and Lateysha Grace who've been raking in the cash. According to a study by Great Bean Bags, some of the less memorable faces could also be earning a comfortable living as social media influencers.
Don't believe us? Check out the potential Instagram earnings per sponsored post of Big Brother's highest earning alumni.
Big Brother's biggest Instagram earners
1 of 10Lateysha Grace
Estimated earnings per post: £3,110
2 of 10Alison Hammond
Estimated earnings per post: £2,980
3 of 10Chanelle McLeary
Estimated earnings per post: £2,460
4 of 10Alex Cannon
Estimated earnings per post: £1,620
5 of 10Sam Pepper
Estimated earnings per post: £1,590
6 of 10Deana Uppal
Estimated earnings per post: £1,220
7 of 10Andrew Tate
Estimated earnings per post: £1,050
8 of 10Ellie Young
Estimated earnings per post: £1,020
9 of 10Imogen Thomas
Estimated earnings per post: £1,000
10 of 10Kayleigh Morris
Estimated earnings per post: £800
WATCH Lateysha Grace talks Katie Price, Chelsee Healey and Ferne McCann
So these guys have Channel 4 and Big Brother to thank for their cushty lives, and Imogen Thomas, who ranks at number nine, did exactly that when the show turned twenty in June.
Taking to her Instagram to share the press shot from the series she starred in (series seven in 2006 AKA the best series EVER), Imogen wrote, "Big Brother seven: 14 years ago. I will never forget the phone call I had from producer Phil Edgar Jones offering me to be a housemate.
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"I was hiding in between curtains at work. I screamed YES! Two days later off I went into hiding to France and Belgium. Two weeks later the day finally arrived for me to walk into the famous house.
"My God was I nervous. I felt sick to the pit of my stomach. But I did it 🥳 and there my life changed for the better. Thank you to big brother for this opportunity. You turned my life around. The best show on tv, which started off to be an innocent, social experiment. It gave me opportunities beyond belief. You made my future very comfortable for myself and my children. I will be forever grateful."