Becky was born in Kanagawa Prefecture to a Japanese mother and an English father, Simon Rabone.
[6] Although The Japan Times previously erroneously reported her full name as "Rebecca Eri Ray Vaughan",[7] Australian airline Jetstar Airways, having used her in advertisements and promotions aimed towards Japanese audiences,[8] gives her full name as being "Rebecca-Eri Rabone",[9] this surname matching that used by her father and sister; the error arises from the fact that 'Rabone' and 'Ray Vaughan' would be spelled the same way in Japanese.
In January 2016, Becky's reputation as Japan's most popular female personality took a hit after Japanese tabloid Shūkan Bunshun revealed that she had an affair with musician Enon Kawatani who at the time was married.
In order to appease the public backlash and as a condition for her comeback to show business in Japan, Becky tried to officially apologize to Kawatani's wife.
Beginning in late 2009, Becky began recording under the name "Becky♪♯" (ベッキー♪♯, Bekkī), and her first single under EMI Music Japan debuted in the top 10 of the Oricon's Daily and Weekly Charts.