Beyoncé better watch out, because nothing can stop Barbadian superstar Rihanna from taking over the international music scene. The Def Jam recording artist has been named Billboard’s #1 Pop Artist of the year, according to MSNBC.com. The “Good Girl Gone Bad” songstress and fashionista took home 3 American Music Awards and sold 11 million copies worldwide of her chart-toping album last year. —QS