Sitting pantsless on the ground, the photo shows the Underworld star holding an acoustic guitar with the neck facing her, and she holds it with both hands while licking the end of it.
The caption she placed on the photo says, "Let's learn from this about saying 'no thank you,that's very much not my vibe but thanks for asking me and do feel free to lick your guitar yourself.'"
The caption might be a clue that this is a picture from a professional photo shoot that she maybe didn't want to take but did anyway ta the behest of the photographer.
Even so, it's still certainly a head-scratcher.
Kate is no stranger to bizarre Instagram pics.
A few weeks ago she posted a really unusual booty pic that was equally as curious.
At just a brief glance, it looks like Kate is baring her whole bottom and wearing a pair of butt-less chaps.
A post shared by Kate Beckinsale (@katebeckinsale) on
When you look closer, however, you can see that what's really going on here is that she's wearing a fake butt prop, most commonly used for a Halloween costume, or something to that effect.
Still, though, the real win here, regardless of it not being a full-on shot of her bare behind, is that we've learned that, just like any regular person, Kate Beckinsale loves making butt jokes.
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[H/T: Kate Beckinsale / Instagram]