The Products Lana Condor and Noah Centineo Use in Always and Forever, Including a $4 Lip Liner

Centineo's beauty prep to get into character for Peter is understandably a lot simpler than Condor's, but that's not to say he doesn't have his own pared-down routine. In real life, Centineo has curly hair but Brady enhanced it with one special product. "I texturized it like crazy to get that curly look [using] small amounts of Sebastian Microweb Fiber ($22) all over," said Brady. "They really wanted it looking sort of very, very casual looking, and natural-looking."

Trying to make a 24-year-old look 17 has its own challenges in the makeup department but Olsen said it only took some minor color correcting to hid Centineo's stubble. "[He] has a scar on his chin, you know," said Olsen. "Obviously, it was left and it just adds to his character."