Haim, 36, known in the '80s for his role in The Lost Boys, claims that Victoria gnawed on his lips and made a strange grrhh sound when they kissed.
The pair met in 1995 when Victoria was at a London recording studio with her Spice Girl bandmates. They were 'soulmates', says Haim, who claims Posh was so serious about him that she took him to her family home - where her parents warned him off visiting her bedroom at night.
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When she kisses she does this little grrhh thing. What did it feel like? Like a girl gnawing on your lip!' says Haim in a recent kiss-and-tell magazine interview.
Of their first meeting, the actor, who suffered a drug-induced stroke in 2001 and has been in and out of rehab many times, says: 'These five punk rock chicks walked in and there was Vic - boom. So I had to hang out with her, it was my job as a man.'
The pair split after a blazing row over band Take That - after a cosy evening in watching TV, Posh confessed to Haim that she 'loved' the band.