Kate Middleton never disappoints!

The Duchess of Cambridge donned another dreamy dress, this time while walking the red carpet at the A Street Cat Named Bob premiere in London on Thursday.

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The 34-year-old mother of two wore a floor-length white Self Portrait dress, which featured a daring thigh-high slit. She added a dash of color to her regal ensemble with matching maroon-colored accessories -- a dainty poppy brooch, velvet clutch and pointed toe stilettos.

Keeping the focus on her gorgeous gown, the brunette beauty opted for minimal makeup and bouncy, brushed-out waves.

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Classy as always!

Middleton made an appearance at the premiere because the film benefits one of her charities, Action on Addiction, an organization that helps those struggling with addiction. Inside the private screening, she got to meet some of the stars of the movie, including Bob the street cat.

She also met Bob's owner, Jim Bowen, who inspired the Roger Spottiswoode-directed comedy.

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Middleton is no stranger to red carpets. Last October, the Duchess turned heads in a flowing, powder blue gown while attending Spectre's London premiere with her husband, Prince William.

See pics of their royal entrance in the video below.