Britney Spears spent millions in 2016, but dropped most of it in the same stores where you probably shop -- of course, you probably didn't make over $15 million last year.

TMZ obtained new docs filed in Britney's conservatorship, which show she dropped $10,956,873.91 last year. Sounds like a lot, 'cause it is, but the good news is she earned nearly $16 mil.

According to the docs, her biggest expenses include $122,613 for massages, grooming and nails ... $69,668 on wardrobe and $24,392 for hair and makeup. As much as she's been toning her bod ... the massages make sense.

Her pooches are still very well cared for -- $29,852 for the year, which is slightly down from the previous year.

As for shopping sprees ... she rarely spent more than a few hundred dollars at a time in Pottery Barn, Albertsons, Ralphs, Vons (lots o' groceries), Target and yes ... she had enough time to hit up Bed Bath & Beyond too.

Her total property and assets at year's end were $55,745,288 -- up about $5 million from 2015 -- and that number doesn't even include untold millions more in various trusts.