What did Katie Holmes forget to do last night?

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Lipstick, check. Pointy Stuart Weitzman shoes, check. Discreet manicure, check. Call all of Suri's babysitters ...

Now, what am I forgetting ...

To some fashion critics, it appears that Katie Holmes didn't think she really needed a supportive upper body undergarment under her modern, clean-lined Jil Sander cutout cocktail dress when she presented Sean Penn's award at the Screen Actors Guild Awards Sunday night.

Or perhaps she just forgot. Hey, it happens.

What do you think?

Maybe she was just advertising for the, ahem, SAG Awards?

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Photo: Katie Holmes wears Jil Sander. Which is not enough. WireImage