The rush of people trying to buy Beyonce's new Ivy Park clothing line crashed Topshop's website on Thursday.
Shoppers tweeted about facing long delays and payment problems online as they tried to get their virtual hands on the singer's fitness wear.
Queen B's latest brand is "merging fashion-led design with technical innovation", according to her website.
Topshop said on Twitter that "due to high demand" the site was "experiencing some technical issues."
"We're currently working with our IT team to resolve this ASAP," the company added.
Other online sellers stocking the brand, including Net-A-Porter and Selfridges, did not report any problems with their websites.
Frustrated Bey fans vent on Twitter
What did Topshop have to say?
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