[2] She is the daughter of film actor Ken Watanabe and his first wife Yumiko.

[3] Watanabe's first high-profile modeling season was spring/summer 2007, in which she was featured in runway shows for Anna Sui, Diane von Furstenberg, Tommy Hilfiger, and Vivienne Tam, among others.

Watanabe has been featured in print advertisements for Anna Sui and NARS Cosmetics.

[4] She was the main visual model for Sui's Secret Wish Magic Romance fragrance for both print and video.

[12] On 1 August 2020, Watanabe finalized her divorce with Higashide, promising that they would work together to take care of the children.