Ashton Kutcher has defended Demi Moore’s honor. The “Valentine’s Day” star and his wife were at the after-party for Broadway’s “24 Hour Plays” – where Ashton had been performing alongside Eva Mendes – but the mood turned sour when a fellow guest started to mock the couple’s relationship.

A source told gossip blogger Perez Hilton: “Demi and Jennifer Aniston were happily sitting together in the VIP area when this guy starting really obviously making fun of Demi and things like her relationship with a younger man.”

“It went on for quite a while. Ashton heard it and approached him. At first he thought the guy wasn’t serious and was like ‘what the??’ He then realized he was serious. Ashton lost it.”

Ashton, 31, reportedly flew into a rage at the guest while 47-year-old wife Demi looked embarrassed.

The source added: “It got pretty heated, nobody knew what to do.”