But the 'Come & Get It' songstress swears by a must-have product that leaves her chestnut brown tresses silky and smooth - and now we know what it is!
The brunette beauty reportedly swears by bottles of UNITE 7 Seconds Conditioner, £16.90, to achieve her trademark sleek, glossy and oh-so-dreamy mane.
The cult hair product is sprayed onto strands while damp to help nourish, strengthen and detangle, plus it includes a UV protector to safeguard against the sun's harmful rays.
And Selena's not the only A-lister who can't get enough of the product - apparently blonde bombshell Paris Hilton is a huge fan too!
We also have trouble with knots and tangles so we reckon this product paired with Kendall Jenner's favourite Wet Brush, £11.99, would be a match made in barnet heaven.
And another hair product we're loving at the mo' is L'Oréal Professionnel Mythic Oil Seve Protectrice, £13.59. It's a rich, luxurious cream formulated with black cumin oil that provides heat protection and also helps banish tangles, leaving your bonce baby soft. We can't live without it!
What are your favourite haircare products? Let us know by commenting below as the best comment across the site each week wins £50!
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Watch Selena's video for 'Come & Get It':