Lili Reinhart taught Madelaine Petsch how to take care of her skin.
Lili Reinhart
The 22-year-old actress helped her 'Riverdale' co-star with her beauty regime when the pair lived together, and although she's a "product junkie" the star was able to help Madelaine, 24, "narrow down her routine."
In an interview with PEOPLE, Madelaine said: "Lili was actually the person who got me on a good skincare game and taught me about the steps you're supposed to take.
"She helped me narrow down my routine, which is so funny because she is such a product junkie too."
If this wasn't enough, the blonde beauty, who plays Betty Cooper on the CW drama series, also used to help out Madelaine - who portrays the villainous Cheryl Blossom - by popping her zits and blocked pores.
She said: "When we lived together, I used to lay in her lap at night and she would go to town on my blackheads."
The beauty wears a lot of make-up when playing her bewitching alter-ego - including her characters signature bright red lipstick - and the star has admitted that she used to struggle with removing all the products from her face, but has since started a new routine, which includes a baking soda cleansing foam.
She said: "I used to be very OCD about getting my makeup off and would triple wash my face. But for the past few months, I've been using the Bioré Micellar Water. I use to baking soda version when my skin is dry, and the charcoal formula when I'm oily, and go in afterwards with the Bioré Baking Soda Cleansing Foam.
"The micellar water takes off my makeup so well and then the face was really cleanses my pores."