The eccentric superstar is said to be a fan of Dr. Bronner’s 18-in-1 liquid soap, which can be bought for a purse-friendly price of £1.99.
According to British newspaper The Daily Mail, stars including Gwyneth Paltrow, Drew Barrymore, Sandra Bullock and Eminem also use the high-street beauty buy which can be used for a bizarre range of purposes.
The publication writes; "And not only can you use it to clean your body, your mouth and teeth with the curious product - you can even use it to wash your fruit and vegetables, toilet, clothes and even your pets."
Gaga - who was photographed bathing in Dr. Bronner’s Magic Organic Almond Liquid Soap following a cupping session recently - is reportedly a fan of the range because of its pure high potency oils.
The most famous product from the collection, the original Peppermint, is sold in high end stores including Selfridges and Liberty.
Although they have huge budgets for luxuries such as beauty buys, some stars don't see the point in splashing out on expensive products.
Emma Watson revealed her budget beauty buy last year, explaining she uses Figs & Rouge Rambling Rose organic balm, which comes in at a very respectable £4.99.
"I am obsessed with organic skincare and was overjoyed to see how beautifully packaged Figs & Rouge products are," she said.
Courteney Cox is also a fan of purse-friendly products, and wrote on her beauty blog last year that her trick to looking red carpet ready is a $9 Clairol hair colour treatment.
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