When Nick Cannon does something, he does it big. So last night, he proposed to his girlfriend of three months, Victoria's Secret model Selita Ebanks -- right in the middle of Times Square! Earlier that evening, the couple attended the Metropolitan Museum of Art costume gala, Page Six reports. Then, as they were walking through Times Square, Nick got on one knee and gave Selita a 12-carat (!) diamond ring while the MTV Jumbotron projected the words, "Selita, will you marry me?" (She said yes, Nick's publicist tells MTV.)