Stereogum — Last month, Britney Spears released a new version of “Slumber Party,” a track off of her recent album Glory, featuring spaced-out R&B singer Tinashe. And last night, the two of them performed that new version together for the first time, bringing... more info

PopSugar UK — Britney Spears celebrated her 35th birthday surrounded by her fans at 102.7 KIIS FM's Jingle Ball in LA on Friday night. Not only did she deliver an incredible performance of a medley of her hits including "Slumber Party" and "Womanizer," but the eve... more info

PopSugar — Britney Spears celebrated her 35th birthday surrounded by her fans at 102.7 KIIS FM's Jingle Ball in LA on Friday night. Not only did she deliver an incredible performance of a medley of her hits including "Slumber Party" and "Womanizer," but the eve... more info

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