ET Online — The pop princess was even treated to a surprise cake onstage from host Ryan Seacrest! more info

E! Online — Happy birthday, Brit! Britney Spears turned 35 Friday and received a birthday surprise at KIIS-FM's iHeartRadio Jingle Ball 2016 concert at Staples Center in Los Angeles, where... more info

Idolator — They caused a commotion. more info

TMZ — Britney Spears celebrated her 35th birthday with roughly 20 thousand people Friday night, and revamped an old 'do for the occasion.  Spears performed at KIIS FM's Jingle Ball in L.A. -- along with Justin Bieber, Bruno Mars and a… more info

Idolator — Entertaining. more info

PopSugar — There are some things that only true, dedicated Britney Spears fans will understand. Her career spans decades, moving from plaid and pigtails to sequined bodysuits to the fierce look she has today. From the schoolgirl era to the VMAs stage, Britney's... more info

PopSugar UK — There are some things that only true, dedicated Britney Spears fans will understand. Her career spans decades, moving from plaid and pigtails to sequined bodysuits to the fierce look she has today. From the schoolgirl era to the VMAs stage, Britney's... more info

E! Online — Remember enhanced CDs? Not too long before Facebook, Instagram, Snapchat, Twitter and YouTube became the go-to destinations for music fans, record labels released albums with exclusive... more info

PopSugar UK — It goes without saying that Britney Spears is one of the most iconic artists of our time, and because of that, she's given us plenty of memorable moments to obsess over. Her "I'm a Slave 4 U" performance with a boa constrictor at the VMAs? Her see-th... more info

ET Online — With a career spanning over 15 years and 10 studio albums, America has followed pop princess Britney Spears through good times and bad, from "Baby One More Time" to "Work B**ch." more info