Speaking on the red carpet of the National Television Awards on Wednesday, the former prison guard admitted she had so far only "spoke to him on the phone" since winning the competition in December.
But Bailey revealed that Cowell did offer her some good advice when they did speak.
"He's told me not to hold back, to go out there, say what I mean and live the dream," she said.
The singer opened the show at this year's NTAs with a special performance with U.S singer Michael Bolton.
She also appeared later in the programme to give an emotional rendition of the Jennifer Rush classic Power of Love.
Bailey revealed she has been moved to tears recording her much anticipated debut album, which features a contribution from Bolton.
She said: "It was blood, sweat and tears, literally. Me crying in the vocal booth, I didn't want anyone to see me crying, so there's lots of emotion in there."
Speaking backstage, Bolton said: "I'm happy I got to sing with Sam (on X Factor) I've been a big fan of hers and I was rooting for her to win. We've been doing some recording together."