On Sunday's show Sharon can be heard asking Louis "what's her name?" through her teeth before eventually introducing Saara.
The cameras were focussed directly on Sharon for the awkward moment.
"It's just me, I'm a bit dotty... but drinking? No thank you," she told Susanna Reid on Good Morning Britain.
During the interview she laughed as co-host Piers Morgan asked if she actually had any idea who she was mentoring.
She put it down to "blanking" and says she is "the worst in the world" with names.
"I have seen too many careers and family members destroyed from alcohol and this missus ain't going there.
"I was just thinking about something else. I wish I could come up with a better excuse," she said.
It wasn't her first blooper of the weekend though.
On Saturday Sharon accidently announced Saara instead of her other act Relley C.
But this could be blamed on Simon as he could be seen saying the wrong name to try and trip her up during the introduction - and it worked.
In the interview she said the other judges try to make her get it wrong all the time.
"I've got one name coming from Louis, one from Simon and they do it to wind me up and I fall for it."
Finland-born Saara Alto is used to Sharon's slip ups.
Last week Osbourne said "she's come all the way from Norway" which was, of course, incorrect.
Right area, wrong country Sharon.
She finished by promising that she will remember everybody's names next week.