Pregnant Kate is flawless in black lace Diane von Furstenberg gown

Kate Middleton Prince William Royal Performance 2014
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Pregnant Kate is flawless in black lace Diane von Furstenberg gown
The Duchess of Cambridge arrives for the Royal Variety Performance.
Kate looked glamorous in a new black lace Diane von Fustenberg gown.
William and Kate are in for an evening of performances from some of the UK's finest artists.
The royal couple looked absolutely stunning!
Kate's hair was pulled back in a rare updo, an elaborate and lovely style. She wore a very sparkly pair of diamond earrings.
Harry apparently congratulating Kate "on the bump." 
Prince William also happily chatted with the boys of One Direction.
Kate was glowing and did a classic smoky eye, rosy cheek beauty look.
The Duchess of Cambridge meets Charlotte Tomlinson, aged 6, and her mother Cathryn at The Royal Variety Performance.

The Duke and Duchess of Cambridge attended the Royal Variety Performance in London tonight, dressing in their finest black tie. Duchess Kate looked every bit the Princess in a gorgeous black lace Diane von Furstenberg gown ($898 at Neiman Marcus). Her hair was pulled up in an elaborate chignon, and she positively glittered with drop crystal earrings by Kiki McDonough.

William looked dapper in a black tuxedo, and the royal couple stole the show. The expectant parents were in attendance for performances by some of the UK's biggest names - including Ed Sheeran, Elie Goulding and One Direction. One Direction was actually waiting for William and Kate's arrival, so they could greet the royal duo. Harry Styles reportedly said to Kate, "I said congratulations on the bump. (Though) she didn't look bumpy." Too funny.

Kate Middleton meets Harry Styles
We love when Kate gets all dolled up for a glamorous event, and expected we'd see something pretty fancy for tonight's performance. As is standard for our favorite royal, she did not disappoint.

Click through the gallery to see more photos of William and Kate's glamorous evening on the town!

Photos: Getty Images
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