Serena doesn't splash out on expensive products. (Picture: Instagram)

The tennis legend has admitted that she doesn't splash out on expensive products to look after her curls, and instead opts for cheaper options that can be found in a supermarket. 

In an interview with Yahoo! Lifestyle, she said: "Beauty wise, I go to Target, and they literally have everything. Anything that says 'curls,' 'manage your curls,' 'proud of your curls,' I'm drawn to it."

Serena - who is the number one ranked female tennis player in the world - admits she doesn't usually buy a product unless a black model features on the advertisement for it.

She said: "I feel like there's so much out there for natural hair and curly hair and black hair, which I love. I've literally tried everything - from Miss Jessie's to Curls. I have a whole cabinet full of products. I think every black girl does for hair. If the ads use black women or women like me, then I think, 'OK, I'm going to try this product. But if they have ads with anyone who doesn't look like me, I usually don't try it."

The 36-year-old sports star has also revealed that her go to beauty product for her skin is coconut oil, and she'll use it whenever she wears a lot of makeup. 

She said: "I'll go home, dig my hand in the coconut oil, spread it on my face, and [the makeup] falls off. It also works as a moisturiser for me."

Serena - who has 10-month-old daughter Alexis with her husband, Reddit co-founder Alexis Ohanian - has also revealed she is a master of eyebrow maintenance and doesn't need to rely on anyone to keep her brows brilliant.

She said: "I use a pencil - I never use powder. And I'm really good doing them. I cut them, I'll do the whole shebang."