 Complete the following phrase:  Monica has sold 5.3 million albums in the United States and she is recognized as one of the most successful urban RB female vocalists to begin a career in the mid to late 1990s. According to Billboard, she is the youngest recording act to ever have two consecutive chart-topping hits on the Billboard Top RB Singles chart, as well as the first artist to top the US a hrefHot20R26amp3BBHip-Hop20SongsBillboard Hot RBHip-Hop Songsa chart over the span of three consecutive decades 1990s, 2000s, and 2010s. In 2010, Billboard listed Monica at number 24 on its list of the Top 50 RB and Hip Hop Artists of the past 25 years. A four-time nominee, she won a Grammy Award for Best RB Performance by a Duo or Group with Vocals for her contribution to The Boy Is Mine alongside Brandy, at the 