Simon Cowell is still in a relationship with Lauren Silverman.

The 53-year-old 'X Factor' boss is dating the newly separated New York socialite, who is pregnant with their first child, and they already have strong feelings for one another as they allegedly began having an affair in 2009.

A source close to Lauren, who has a seven-year-old son Adam with her estranged husband Andrew Silverman, told Us Weekly magazine: ''Lauren has loved Simon forever. And they started having an affair four years ago.''

The source added that the couple were originally only hooking up sporadically but they are more serious now that Lauren is pregnant.

The insider added: ''Simon and Lauren are together. They talk 100 times a day.''

The 36-year-old brunette beauty is set to give birth in February and Lauren's mother Carole Saland has insisted her marriage was already beginning to unravel when she met Simon at the plush Sandy Lane resort in Barbados.

She said: ''The marriage was not made in heaven.''

A friend added: ''Andrew always went on trips without her. She felt he treated her like garbage.''

Andrew, who was one of Simon's good friends, filed for divorce last month, naming the music mogul as a co-respondent in papers and citing adultery as the reason for the failure of his marriage.

Simon is reportedly excited to become a father for the first time, but is giving his married lover - who is 11 weeks pregnant - space in order to reach an agreement with Andrew.