The 'X Factor' boss was seen kissing his girlfriend outside Scalini restaurant in Chelsea.
Simon and Lauren are reportedly in London so the New York socialite can meet Simon's mum properly.
However, Simon could also have been discussing a dramatic 'X Factor' return, as the pair enjoyed a date with Louis.
The music mogul has been looking increasingly loved-up lately and last week told the red carpet audience at London's One Direction film premiere, "My life is changing and for the better. She (Lauren) is a special girl."
Is Simon Cowell a changed man? Or is he simply trying to change his womanising reputation? Take a look at the pictures below and let us know your thoughts...