It's hard to believe that Kristin Cavallari gave birth to son Camden Jack just four months ago.

KCav is already back in her hot pants, sporting a particularly short pair on Tuesday -- an unseasonably warm day in New York City -- when she was spotted leaving the NBC studios.

And although Cavallari's incredible post-baby body is 100 percent real, the star admits that the same can't be said about her former MTV reality show, "The Hills."

"Fake relationships, fake fights," she recently told Andy Cohen on "Watch What Happens Live."

Check out Cavallari's leggy look below:

kristen cavallari post baby body

kristen cavallari post baby bump

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