Interestingly, the track wasn't originally intended for Britney Spears. It was co-written by British singer (of N-Dubz fame) for her debut album The Female Boss .

A hip-hop-focused remix was released in 2013 featuring an all-star lineup including Lil Wayne, Hit-Boy, Waka Flocka Flame, and Diddy .

Directed by Ben Mor, the video is famous for its "multiplicity" theme and heavy product placement for will.i.am's own tech ventures, such as his iPhone camera add-on and Beats by Dre "Pill" speakers.

The music video, which features themes of multiplicity and futuristic clones, surpassed one billion views in May 2023—marking Britney Spears' first entry into the Billion Views Club.

Fans often point out Britney’s unusual "British accent" in the song. In 2024, Tulisa claimed on a podcast that her original lead vocals were actually left in the final mix, which would explain the accent. However, leaked recording sessions from late 2024 appear to show Britney herself singing the parts, suggesting she may have just been experimenting with her voice in the studio. Commercial Milestones

It peaked at #3 on the Billboard Hot 100 and was the very first #1 song on the then-newly established Dance/Electronic Songs chart. Production & Visuals

The song was a massive global success, becoming a "Billion Club" member on multiple platforms:

Tulisa later sued will.i.am for songwriting credits. In 2018, she won the case and was awarded a co-writing credit and 10% of the song's publishing rights.