After attending the British Fashion Awards [1] on Monday, Lady Gaga [2] stepped out for the annual Royal Variety Performance in London on Tuesday. Gaga wore a gorgeous pale pink gown for the charity event [3], which dates back to 1912 and helps support artists in the entertainment industry. Once inside the Hammersmith Apollo, Gaga lined up alongside British singer Robbie Williams to greet Prince Charles and his wife, Camilla. Unfortunately, Prince William and Kate Middleton were not in attendance, but Prince Harry did serve as the guest of honor [4] last year.