The beauty product in question? None other than Vaseline Cocoa Butter Rich Conditioning Jelly. The 24-year-old actress revealed it's one of her go-to items, as she uses it not only to help take off excess eye makeup at the end of the day, but as an eye cream as well.

In the video, she reveals that her love of the product began when she would apply Vaseline to her eyebrows and eyelashes in middle school to attempt to see if they would really grow in volume. Instead, something else happened. "I realized it helped take my eye makeup off really gently," Sweeney shares. "I just never liked the harsh rubbing of eye makeup."

The inexpensive skin savior has a history that goes way back. Used for centuries in Indigenous communities for its healing properties, it was trademarked in 1865 when chemist Robert Chesebrough patented the petroleum jelly formula, which he named Vaseline. And although it's meant to help heal cracked, dry skin, it also has a lot of other beauty benefits, from aiding in wound healing to preventing moisture loss.

With such great benefits (and an affordable price point), it's become a staple product, especially for those with sensitive skin like Sweeney. "I was finding that a lot of under-eye creams or oils, or whatever products, were not working for me," she says. "It would make my makeup sit strange, and I felt like my eyes were getting dry, or it wasn't right. And then, I started doing this, and, you guys, it's been a life changer."

Of course, Sweeney does have some other favorite products as well. Further all-stars in her routine include a variety of LANEIGE products (she was recently named the brand's first U.S. partner), as well as Instagram-darling SolaWave. If you, too, want your skin to have that Cassie Howard glow, shop more of Sweeney's nighttime routine below.