'X Factor' judge Sharon Osbourne has reportedly been warned about flirting with the contestants on the reality television show.

According to the Daily Mirror, Osbourne has been asked to tone down her comments after she made suggestive remarks to singer Shayne Ward during last weekend's show, which was pre-watershed.

According to the newspaper report, an insider said: "It's not really appropriate for Sharon to talk to Shayne in that overtly flirtatious way."

"Everyone loves Sharon and she is great entertainment but on this occasion she has gone just that little bit too far."