Jennifer Lopez showed up in the U.K. Tuesday night and performed a "incredible" theatrical that got many viewers complaining.

With blue gorilla sleeves, a black leotard, and thigh-high boots, the outfit Lopez wore shocked the family-audiences who sent complaints to the Office of Communications.

However, the Britain's Got Talent judge Simon Cowell tweeted saying that she was "incredible on the show tonight. A total superstar."

The outfit she wore was similar to the one she wore in Billboard Music Awards that was red in color instead.

The talents contesting for a spot on the finals are the following: Stevie Pink, the master illusionist; Rosie O'Sullivan, the 19-year-old powerful singer of Man's World; Thomas Bounce, 16-year-old juggler; Freelusion, futuristic interactive dance group; Luminities, the harmonious beat-boxing singer group; Pre-Skool, little cute kids in sync; MC Boy, the singer-dancer that got everyone to join the act; Robbie Kennedy, the modest, average guy with an amazing voice; and last but not least, Joseph Hall, 35-year-old fierce dancer.

Don't miss the show that starts at 7:30pm at ITV.