03/18/2015 09:10 EDT | Updated 03/18/2015 09:59 EDT

Kate Middleton's ASOS Dress Sells Out In Minutes After Children's Centre Visit

The Kate Effect is still going strong!

On Wednesday, March 18, the Duchess of Cambridge visited the Brookhill Children's Centre in London wearing a £35 ($51 US) ASOS maternity frock that sold out minutes after she arrived.

According to the Mirror, fans of Catherine went nuts over the "Wrap Skater Dress in Spot Print" and we can see why -- the mum looked gorgeous in the flattering knee-length frock, which hugged her growing belly. Kate styled the dress with a tailored black jacket (which she later removed), black pumps, a clutch and her signature wavy locks.

The pregnant Duchess, who's due to give birth in April, was meeting with members of the charity Home-Start, whose volunteers help almost 30,000 families each year.

The visit marks one of Kate's last appearances before she goes on maternity leave. Yesterday, the 33-year-old mum handed out shamrocks during a St. Patrick's Day ceremony and last week she visited the set of "Downton Abbey" and attended a service honouring those who lost their lives fighting the war in Afghanistan.

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