Simon Cowell is rumoured to be dating Carmen Electra.

The X Factor supremo and the former Baywatch actress were apparently spotted "making out" on a dinner date in Los Angeles, sparking speculation that they are an item, reported The Sun.

A source said: "They were getting very cosy. They were holding hands and staring into each other's eyes - then they started making out."

Photographs of the pair after the meal show Simon, 52, with his arm around the 40-year-old former Playboy model as they left the West Hollywood eatery together.

Simon and Carmen have apparently been seeing each other while he has been working on US X Factor and it is reported that they have enjoyed a string of dates.

A friend of Carmen's said she is "getting back in the dating pool" following her split from guitarist Rob Patterson earlier this year, adding: "Simon treats her very well. It's all very laid back at the moment but they are both enjoying themselves."

However, a source told E! News that Simon and Carmen are "just friends" and that they were out for dinner with a big group of friends.

The insider said: "They are just friends from the UK and the US. They have known each other a while and she guest judged on Britain's Got Talent."

Neither star has commented on the romance rumours.

Simon previously dated model and TV presenter Terri Seymour and was recently in a relationship with make-up artist Mezhgan Hussainy. Carmen was previously married to Dave Navarro and Dennis Rodman.