Audience members at the taping of the special also revealed that the Spice Girls star caused a stir amid the most emotional moment of the night - when actress Emma Thompson surprised Adele with her beloved high school English teacher, who was in the audience. But Mel B was reportedly "shouting" over the lead-up to the emotional moment, "totally ruining" it.
The network behind the special, ITV, was reportedly "not upset" with Mel B, simply deciding to remove her appearance knowing that countless families with children would tune in to see Adele sing.
"There's no bad blood or issue between them," the source said. "ITV just couldn't air it because not only was it awkward as hell — it was a family show and there would be kids watching."
It's not the first time Adele has seen drama since dropping her new album 30 last Friday.
The 15-time Grammy winner reportedly left an interview with Weekend Sunrise host Matt Doran when he admitted he hadn't actually listened to her album before their chat.