Kate Hudson's four-year-old son has developed an obsession with undressing women.

The actress is currently battling to deter Ryder - her son with ex-husband, Black Crowes rocker Chris Robinson - from stripping every woman he meets.

She says, "I'm working on trying to get him off being interested in female parts. He thinks it's hilarious when he pulls off my shirt. It's started - the interest in boobies."

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(This news article provided by World Entertainment News Network)