Lady Gaga swept the U.K.'s Brit Awards Tuesday winning three categories and offering an emotional tribute to Alexander McQueen, the British fashion designer who died last week. At points, the 'Pokerface' singer appeared overcome with emotion and even paid tribute to McQueen as she collected her first prize -- referring to the designer by the name Lee. "Thank you to Lee McQueen," Gaga said, her voice strained. Later, she performed wearing a towering white wig and nearly nude lace outfit. "This is for Alexander McQueen," she said. Watch: