Should fans be concerned about Diane Kruger?

The 39-year-old showed up to the amFAR Gala in NYC on Wednesday looking skinner than ever in a pale-blue Prada gown decorated with black ostrich feathers.

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diane kruger

And while the back of the actress' dress had plenty of gorgeous detailing, we couldn't help but be distracted by what appears to be her ribcage peeking through.

Diane's longtime boyfriend, Joshua Jackson, was noticeably absent from the star-studded event, which once again stirred up rumors that the couple had split.

diane kruger getty images

As Life & Style previously reported in December, the blonde beauty was allegedly caught cheating on The Affair star with fellow celeb, Norman Reedus.

Scroll down to see more stars who've been criticized over their weight by fans.