Tatiana Aleksandra Westbrook is an American internet personality, YouTuber, businesswoman and make-up artist

Westbrook, a former image consultant turned makeup artist, created her YouTube channel GlamLifeGuru, later renamed Tati, on November 7, 2010. When she started, she knew little about cameras and editing. "At first, when I sat down to edit, it would be a twelve-hour process," Westbrook recalled in 2015. "Beauty tutorials still take a long time, but I've been able to get this down to three hours."

According to Newsweek she is, "Widely considered to be a progenitor of YouTube’s beauty scene," and, "The mother of the YouTube beauty community". She reached the one-million subscriber milestone in early 2016.
She primarily focuses on make-up and beauty reviews, tips, and tutorials. On October 25, 2019 she launched her own cosmetic line called Tati Beauty, with her first product being a textured neutrals eyeshadow palette.

Entrepreneurship
In February 2018, Westbrook founded and launched her own company called Halo Beauty Inc. which sells vitamin supplements.

Westbrook makes an estimated $1.3 million a year between YouTube and Halo Beauty.

On April 22, 2019, Westbrook posted an Instagram story in which she talked about feeling betrayed by the beauty community. A few hours prior to Westbrook's post, fellow beauty YouTuber James Charles posted an advertisement about Sugar Bear Hair, a direct competitor to Westbrook's own brand of vitamin supplements: Halo Beauty. On May 10, 2019, Westbrook posted a YouTube video titled BYE SISTER... in which she claimed that an ongoing feud between her and Charles was not only about advertising, but also about her history with Charles and allegations that he preyed on heterosexual men. Westbrook gained more than four million subscribers within a period of a week as a result of the video, and Charles lost more than three million subscribers in four days. She reached her peak, amassing a following of over 10.6 million subscribers at the time. Charles responded to the claims on May 18 with a video titled No More Lies in which he shared his side of the story. Westbrook subsequently lost over a million subscribers, as well as eligibility for YouTube's Diamond Creator Award, and has 9.4 million subscribers as of June 2020.