Kelly Osbourne was out shopping with her boyfriend Luke Worrell yesterday on Melrose in L.A. when she decided to do her Mary-Kate Olsen impersonation.

Lucky for her, Luke's spindly arm was able to prevent her substantial frame from crashing to the pavement. Wow; the guy must be stronger than he looks.

And so another awkward moment is added to a life that's been full of them.

The whole thing was probably Lindsay Lohan's fault, anyway. LiLo saw Kelly with Luke, mistakenly assumed that Kelly was moving in on her main squeeze, and made a Kelly Osbourne voodoo doll, which she then knocked over with a flick of her index finger.

It's hard to blame Lindsay; the resemblance is pretty startling.

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