Kate Hudson wore a super-sexy dress to the 2013 Golden Globes Sunday, Jan. 13, but it's hard to tell whether her Glee costar Lea Michele loved or hated the look! When Hudson, 33, took the stage with Bradley Cooper to present the first award of the night for Best Supporting Actor in a Motion Picture, Michele, 26, reacted in a big way.

The Fox star's jaw dropped and she appeared to say, "Oh my God," while grabbing a friend's arm. Hudson styled a black, form-fitting Alexander McQueen gown with a cut-out detail in front to reveal maximum cleavage. She accessorized the dramatic look with Jennifer Meyer jewelry.

Hudson has been playing Michele's dance teacher on Glee Season 4. In August, an insider told Us Weekly that The Reluctant Fundamentalist actress found Michele to be "a total diva" on set.

"Kate says Lea is a nightmare," the source said. "Once, during a technical delay, Lea snapped her fingers and said, 'Let's go. I have plans!'"

Watch Michele's reaction to Hudson's appearance at the Golden Globes in the video above now!