Zoe Saldana stepped up to the fashion plate -- and almost tripped! -- during the Star Trek Into Darkness premiere at London's Empire Leicester Square May 2. Wearing a black and white Vionnet gown and Christian Louboutin heels, the 34-year-old actress leaned on costars Alice Eve, Zachary Quinto and Benedict Cumberbatch as she fluffed out her skirt's train.

The stars were joined at the event by director J.J. Abrams and costars Chris Pine, Simon Pegg, Karl Urban and Noel Clarke. Saldana completed her look with Tiffany & Co. jewels and a Christian Louboutin clutch.

PHOTOS: Zoe Saldana's best style moments

Since Saldana joined the worldwide press tour in late April, the actress has worn eye-catching looks by Balmain Calvin Klein Collection. "Thank you everyone for your love and support," she tweeted Apr. 28. "Feel blessed to have your respect." 

Star Trek Into Darkness is in theaters nationwide Apr. 17.

This article originally appeared on Usmagazine.com: Zoe Saldana Nearly Trips on Her Dress at Star Trek Into Darkness Premiere