The X Factor winner Sam was on the ITV morning show Loose Women, for which Sharon is a host, and introduced baby Miley to Sharon for the first time.
Sharon exclaimed: "Oh my goodness, she’s so gorgeous, what a perfect little angel."
Of being asked to take on the role of godmother, Sharon said: "It’s the first time I’ve been asked to be a godparent so it’s huge for me."
"It’s really overwhelming, you feel so honoured to be put in that position of trust and it’s just wonderful, I love it.", she added.
"Sharon is a grafter." Sam said of her former The X Factor mentor.
"She was flying there and back, tooing and froing, she’s got her kids to sort out, she’s got everything to sort out. She was working, doing the show, she was there for me at the end of the phone and if anything this lady plucked up the courage for me to go out there and smash it every week so I’m eternally grateful. I love her, love her."
In an exclusive interview and photoshoot with HELLO! magazine in September Sam revealed her little girl's name, Miley Beau Pearson – but says it has nothing to do with fellow famous singer Miley Cyrus, telling HELLO! magazine, "I just really like the name."
Chart topper Sam, 37, says that she was only able to fulfil her dream of having a third child – she already has daughter Brooke, nine, and five-year-old son Tommy with husband Craig Pearson – because she won the hit ITV show last year.