She began her career appearing in GUESS advertisements in the late 1990s after being discovered by an Elite modeling agent at age fourteen.

[5] At age 13, Garrett was discovered by an Elite modeling agent while singing Christmas carols with her school's choir in a Los Angeles shopping mall.

[7] Commenting on modeling at a young age, she said: "That was such a kind of strange and interesting time, those years, but it wasn’t sustainable for me.

[13] In 2017, Garrett performed the role of attorney Jessica Preston in the hit ABC series The Good Doctor.

[14] In 2024, Garrett was added to the cast of The Madison, an upcoming spinoff series of Yellowstone, set to premiere in 2025.