Britney Spears hasn't had a big hit in almost four years, and critics say her career is slumping. This all would change when she dropped her song "Toxic." ♪ It's dangerous ♪ ♪ I'm falling ...

The actress wore one of Spears' iconic ... looks from her 2004 “Toxic” music video. The Honest Company founder wasn't the only party guest getting into the Britney Spears spirit.

In a series of photos and a video posted to the pop star's Instagram, the "Toxic" singer ... the occasion, Spears wore a one-shoulder gown adorned with multi-colored sparkles. Britney Spears ...

The Toxic singer often uses her Instagram posts to share her more personal thoughts (Picture: Britney Spears/Instagram) Since being freed from her father’s control, Britney and Jamie have ...

In another moment, the "Toxic" artist — who lip-synched along to the track — scrunched up her nose and stuck out her tongue directly at the camera. Singer Britney Spears attends the ...