Lady Gaga is shooting a big-budget music video at a castle built by newspaper publisher William Randolph Hearst.
The San Luis Obispo Tribune reports that filming is taking place this week at the indoor blue-and-gold tiled Roman Pool and the outdoor Neptune Pool at Hearst Castle on the California coast.
The pop diva had yet to be seen as crewmembers arrived with bags full of fake flowers and a giant plaster seashell.
Shoots at the state historical site are extremely rare. Gaga is donating $US250,000 ($A277,377) to the Hearst Castle foundation in addition to underwriting a $US25,000 ($A27,737) water supply study and paying special fees.
She will also make a water conservation public service announcement and a short feature on the castle.
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