UPDATED: Six years into their marriage, and 33-year-old Ashton Kutcher - probably the highest paid TV actor in the world - is straying from his 48-year-old wife with a 23-year-old "mystery women." Who saw that coming?

Apparently RadarOnline knows who the "mystery" lady is but are "choosing not to identify her." Probably because she's after hiring a top notch lawyer. Which probably means she's famous. Unless the lawyer she's hired is Gloria Allred. Then she's just in the same ranks as Tiger Woods' flings.

Star magazine, which just so happens to be RadarOnline's sister company, are due to publish claims the couple split some time ago due to his "alleged" cheating: "Ashton and Demi have separated and the marriage is over. The relationship ended because of Ashton's serial cheating. It's a painful time for Demi."

Not so painful for Ashton considering he was spotted on a "booze-fuelled boys night" at a club in San Diego on Friday night - on the eve of his wedding anniversary. Instead of maintaining a dignified silence, Demi has reportedly taken to Tweeting pictures of herself "sleeping alone" with captions such as "see through you"... which makes me suspect she might have a particularly intrusive stalker who invades her room/being and posts pictures of her from her own phone. The other explanation is too disturbing to contemplate.

Some say these tweets are "showing the cracks", when the cracks were there a looong time ago.
 

UPDATE: As it happens, the 23-year-old in question is not famous. Her name is Sarah Leal. She's blonde. Looks like Britney Spears but without the dead eyes. The usual.