It's not even Thursday, but we couldn't help but post a throwback!

Sometimes movie and television roles just aren't enough for celebrities. In fact, before many of these peeps were mega famous, you probably saw them in a music video or two.

Surprise!

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I bet you don't remember Kim Kardashian in Fall Out Boys' "Thnks fr th Mmrs," do you? Or what about Scarlett Johansson in Justin Timberlake's "What Goes Around…Comes Around"?

If it's not ringing any bells, you're not alone. We had to dig deep to find these gems.

kim kardashian, "thnks fr th mmrs"

Record labels may not be shelling out the same massive music video budgets they once did, but just because they've migrated from the big screen to the computer doesn't mean we've forgotten about them entirely.

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These sneaky celebs might not have wanted their past to resurface, but they're so fun, we just had to share!

Click through our gallery below for the best celebrity music video cameos ever!