The 78-year-old is relatively private when it comes to his personal life despite being a well-known face, so it may come as a surprise that he secretly battled cancer while filming a past series of both Strictly and Dancing with the Stars.
The star previously revealed that he battled prostate cancer but at the time decided only to tell a handful of people.
VIDEO: DWTS' Len Goodman and Carrie Ann Inaba seriously impress fans
Talking to The Mail on Sunday, he explained that he decided to carry on working after treatment rather than skip the live shows on DWTS.
He said: "I could have said 'sorry' and not done the show, but the doctors felt I wasn't riddled with it and it wasn’t so far advanced that it was a life-or-death scenario."
He added: "It takes a few weeks to get everything set up for the operation anyway, so I went ahead and did the show. I had the surgery done as soon as I got back from America."
He continued: "I've had the surgery now. Everything's gorgeously good."
Len Goodman had a cancer scare during DWTS
This wasn't the only time Len had a cancer scare though and in 2020 he opened up about having a mole removed from his forehead.
Chatting on Good Morning Britain, he explained that he was advised to get his mole checked after someone noticed it while he was playing golf.
The DWTS judge is now back to full health
"I'm not medical at all, so I said, 'I don't know, what is it?' I went and they took it out and it's gone. It was a tiny little thing on my forehead… probably because I play a lot of golf and I don't wear a hat, which I do now," he said.
“It was good that it was what it was because it was like a little early warning, which was good because I would have probably carried on in my own sweet way and it could have become something far worse!"
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