Bruce Willis Fuming Mad at Ashton Kutcher's Cheating

Recent reports have revealed Ashton Kutcher as a serial cheater, despite posing as a faithful loving husband to wife of 6 years Demi Moore. Now, the entire family has turned upon him, it has emerged.

When Kutcher entered into the May-September marriage, he was welcomed with open arms by Demi's ex, Bruce Willis, and the three daughters they have together, Rumer, Scout and Tallulah.

All four stood by Ashton when the first allegations of cheating emerged online last year, with the girls becoming his most fervent defenders because they couldn't believe he'd do that to Demi – with a girl almost their age no less.

Now, they're upset. Bruce is particularly mad, with OK! Magazine saying he's determined to give Ashton a piece of his mind the moment he gets his hands on him (story via here).

“They’re horrified,” a family friend says for OK! of the reaction the three girls had when hearing about Ashton's cheating on their mom with Sara Leal.

The shock was huge because they used to consider him a father figure, despite his young age. In fact, they even used to refer to him as “MOD,” “My Other Dad,” the celebrity mag says.

“They really care about their mom and adore Ashton; they don’t want to think of him as a sex-addict monster like Tiger Woods,” the source says.

“Without a doubt, Rumer and Tallulah are angry with him.He slept with a random girl their age [Sara]. I’m not sure which was worse – the fact that it happened, or the fact that he didn’t come clean about cheating until he was caught. It came as such a shock to read about it,” adds the spy.

However, the girls' rage and disappointment is nothing compared to that of Bruce Willis, who still holds Demi in the highest regard and will always love her for being such an important part of his life for so long.

“Bruce believes if you mess with someone he loves, you mess with him. He trusted Ashton not to hurt his family and is planning to give him a piece of his mind. When he finally catches up with him it won’t be pretty… Demi is still a big part of Bruce’s life as the mother of his children,” another spy says for the Enquirer.