It's always tricky to have kids on live TV -- and the sometimes-poised stars of "Toddlers & Tiaras" are no exception!

5-year-old beauty queen Kalia Deliz, who has appeared on the TLC show before, was on FOX's Studio 11 L.A. earlier this week ... where she showed off more facial expressions than Jim Carrrey.

While reporter Jeff Michael tried his best to keep a straight face while Kalia contorted hers, even he (and the crew) couldn't help but crack up.

It's a hilarious clip -- and we're just happy to see a 5-year-old acting like an actual 5-year-old ... and not dressing like a prostitute.

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