Ashton Kutcher's alleged "fling" has been identified as 23-year-old blonde Sara Leal.

Various online reports claim Leal hooked up with the Two and A Half Men star on the 12th floor of San Diego's Hard Rock Hotel ... on the same weekend of Ashton and Demi's sixth anniversary. The couple spent the weekend apart.

Leal is reportedly demanding $250,000 to keep the story under wraps, according to A source tells the site the 33-year-old actor told her, "Kutcher told Sara Leal that him [sic] and Demi Moore are separated and the public doesn’t know yet."

Ashton's wife of six years, 48-year-old actress Demi Moore, recently Tweeted, "When we are offended at any man's fault, turn to yourself & study your own failings. Then you will forget your anger."

TheDirty adds Kutcher's bodyguard took Leal's cell phone number before she came into the hotel room.

Reps for Demi and Ashton have not commented on the matter.