The 37-year-old joined the iconic group on stage for an encore.
The 25-year-old opened up about the disease in her first TV interview since being diagnosed earlier this year.
'The View' co-host said the look was inspired by Lucille Ball.
Spears' book, 'The Woman in Me,' will be released Oct. 24.
The gal pals were all smiles after dining together in Los Angeles on Thursday.
Hilarie Burton opens up to ET about Sophia Bush, husband Jeffrey Dean Morgan and more 'muses' in her memoir, 'Grimoire Girl,' out now.
The actress shares the 8-month-old tot with Darius Jackson.
Sherri shared more details about the topic while on 'Watch What Happens Live' with Andy Cohen.
Jeezy breaks his silence on his divorce from Jeannie Mai in a new statement to ET, saying his decision 'was not made impulsively.'
The songstress was honored with a star on Thursday, and had her family on hand to show their support.
Gwen Stefani chats with ET’s Cassie DiLaura at her Hollywood Walk of Fame ceremony in Los Angeles.
Britney Spears' new memoir contains major bombshell revelations, according to a copy obtained by 'The New York Times.'
Human behavior expert Susan Constantine chats with ET about Taylor Swift and Travis Kelce's body language amid their romance.
More bombshell revelations are revealed in Britney Spears’ upcoming memoir, ‘The Woman in Me.’
