Pop star Pink's ex-husband Carey Hart agreed to appear in her latest music video - but didn't realize the song was about him. The fiery singer split up with motocross biker Hart last year, and used her latest single, love/hate anthem "So What," to help her move on.

The star invited her ex-husband to feature in the track's promo - which sees the singer hack down a tree with the former couple's initials carved into it.

Hart had no idea of the single's content - but Pink insists he is used to her mad ways.

She tells BBC Radio One, "He hadn't heard the song before he showed up for the video. He's a good sport, he knows how psychotic I am, he spent six and a half years with me. A year with me is like dog years..."

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(This news article provided by World Entertainment News Network)