“It’s hard for me to say I’m jealous of the way you’re happy without me,” she sang.
“The conduit to many of the most amazing ladies I love. Happy triple bday @jyorn @erinfoster @nicomiz @katehudson,” Hudson’s friend, Laurie Lynn Stark, captioned the video.
Fellow pal Erin Foster also posted a group selfie in which the Sister star showed off her new buzz cut, joking, “Would ditch them for a guy in one second.”
Hudson recently shaved her head for a role in Sia’s new film alongside Maddie Ziegler. ET caught up with Ziegler at the Teen Choice Awards on Sunday, where the 14-year-old performer gushed about her famous co-star.