By Jamie Roberts It’s a celebrity’s worst nightmare when attending an awards ceremony, but Liza Koshy coolly brushed off an awkward moment. As the Transformers : Rise of the Beasts star, 27, took to the Oscars red carpet at the Dolby Theatre in Hollywood she looked stunning. However, the outfit, made up of a tight red gown and huge eight inch high heels, clearly caused chaos with her movement as the star took a tumble. Despite the embarrassing fall, the actress hilariously brushed it off and blamed an imaginary manhole. As a number of onlookers rushed to try to help her back to her feet the st…