Whether she's walking the runways or appearing alongside Beyonce in a music video, Puerto Rican model Joan Smalls always strives to keep her skin in tip-top shape. In an interview with Harper's Bazaar, she emphasized the importance of knowing your own skin before committing to a routine. "For me, I have to stick to a set regimen that I know works; I've learned a lot about my skin over the years," she tells the magazine. "I tend to get oily on the T-zone of my face, while other areas are normal, so I always cleanse my face with a wash that contains salicylic acid and then I'll moisturize. I also always keep lip balm close by; it creates a smoother surface before applying lipstick." As for a one-size-fits-all tip? "Moisturize a lot," she tells Elle.com point blank. "

Songstress Demi Lovato has age on her side, but admits establishing healthy everyday habits is what keeps her skin clear, radiant and in tip-top shape. " ... I drink a lot of water," Lovato tells Allure, "but the most important thing is not sleeping in my makeup."

Whether she's on tour or finishing up a late-night shoot, Lovato sticks to a strict routine. She relies on makeup remover wipes, followed by a pore-clearing scrub and a hydrating toner, followed by a rich night cream before hitting the hay. In the daytime, Lovato is a firm believer in sunscreen and reapplying throughout the day.

Actress Zoe Saldana goes back to basics when it comes to maintaining her flawless complexion. "I think washing your face twice a day at least is the most important thing to do, especially when you live in a city because there's so much pollution. Then there's moisturizing and wearing sunblock," Saldana tells InStyle. Instead of high-tech tools, she opts for something we all have at home. "My go-to tool I use is a small white towel to wash my face. I buy them in bulk every time I go to Costco."

"My mother was a hippie and very health conscious, so growing up she always encouraged my sisters and I to be as natural as possible," Saldana reminisces. "She gave us a book she bought at a garage sale about natural beauty remedies and we used to look up everything, like how to make masks out of oatmeal or give our hair highlights using henna tea or even rum. Once a year, we all still get together and put mayonnaise in our hair for old times' sake."

Last but not least, a positive attitude plays an integral role in Saldana's skin care routine. "I'm actually one of those people that really enjoys taking care of their skin. I don't see it as work, but really just as part of life, just like brushing your teeth."

With the press calls, premieres and onslaught of different time zones, actress America Ferrera's skin is constantly under different types of stress. "A really amazing facial is my beauty indulgence. I go to Linda Ross in Los Angeles, and she's my savior with all the traveling and flying and lack of sleep and stress. Her facials save me," the actress tells Allure.

When she isn't in Los Angeles, Ferrera practices her own form of skin care rehab that is readily available everywhere she goes. "Once I started drinking more water, my skin, hair and nails all flourished," the actress tells InStyle.

Singer Christina Milian knows her fair share about stage makeup, but when it comes to her personal beauty routine and pulling together a look as a busy working mom, there's only one thing that truly matters: "Lashes," she tells MO-AM magazine. "You can have a whole face of nothing, but if you put some lashes on, it saves the day."