Followers noticed something was awry in the upload, as they stripped off and posed topless to show off their muscles.
The Made In Chelsea stars posed side by side after hitting the gym, showing off their rippling abdominals and biceps.
Spencer, 34, and Jamie, 34, smiled as they placed their hands round their waists as they went topless following their session.
But fans were all left distracted by the snap, as they pointed out that Spencer looked "orange" next to his best pal.
The star looked to have a fake tan, which had been emphasised by the lighting in the gym as they compared him to "gravy".
"Jamie needs a bit more sunshine or a tan," a third said, while a fourth chimed in: "Spencer matching his orange shoes."
It comes after Spencer revealed he had been in training to scale the world's highest mountain in search of his brother's body.
Michael, who was an experienced mountaineer, died aged 22 while descending Everest in 1999 and his body was never recovered.
Spencer teamed up with Disney+ to film himself trying to find Michael – something he says took months of therapy for him to prepare for.
He told The Sun: “It was important for me to get my head around the fact I might come face-to-face with my brother’s frozen body.
“I spoke to a therapist before going there because I knew it was going to be a gut-wrenching and emotional journey.
“And I knew living at altitude for over a month would be tough too.”
