12/06/2011 03:56 pm ET | Updated Dec 08, 2011

Kate & William Attend Gary Barlow Concert For Charity (PHOTOS)

What's better than date night? Date night for charity!

Kate and William joined Prince Charles and the Duchess of Cornwall for a concert at London's Royal Albert Hall tonight. It was the second of two shows performed by Gary Barlow, the current "X Factor" judge who hasn't performed solo in 11 years.

If Gary's rare appearance wasn't special enough, the concert was made extra special by the causes connected to it: proceeds from both last night and tonight's performances went to The Prince's Trust and The Foundation of Prince William and Prince Harry.

As an official patron of the Foundation of Prince William and Prince Harry, Kate showed her support with her husband and in-laws at the show.

She also showed support for a trend she and her sister sparked months ago: sheer tights. Kate switched from nude hose to seasonally-appropriate black sheers, paired with tasteful black pumps (higher than her usual footwear!) and her favorite charm bracelet.

As for clothes, she looked pitch-perfect for a royal night out: short print dress (update: the dress is by Zara... and now sold out!) with a tasteful Ralph Lauren jacket. We're loving the mini length on Kate -- it feels like we haven't seen those thighs since before she became a duchess!

Camilla, unsurprisingly, opted for a longer length skirt by Anna Valentine but chose a flashier top: a velvet jacket with embroidered trim, contrasting nicely with her dangly earrings. Fancy, Cam! She certainly stood out next to her husband, Prince Charles, who wore a plain navy suit much like his son's.

Check out the good-looking royal family as they hit the town! What do you think of Catherine's outfit?