20 Best Love Songs By Real-Life Couples. Whether it’s a chart-topping pop pair, ... “Must Be Love” – Cassie feat. Diddy Mainstream R&B/Hip-Hop Chart Peak: 38 (July 4, 2009) ...

Artist: Cassie feat. Diddy Song: 'Must Be Love' Why You Should Watch: The singer rocks her new hairdo and sorts out her feelings in the video for her first official single off her upcoming album ...