Cassie collaborated with Diddy on the 2009 song “Must Be Love.” The track was released as a single from Cassie’s unfinished second studio album and features Diddy, who was then performing under the name Diddy rather than Puff Daddy.
Cassie Ventura was signed to Bad Boy Records, Diddy’s label, and became closely associated with its blend of R&B, hip-hop, and pop. “Must Be Love” followed her 2006 debut single “Me & U,” which became a major hit and established her as one of the label’s prominent young artists.
The song is sometimes described as a Diddy track featuring Cassie, while other listings treat it as a Cassie single featuring Diddy. That billing difference can cause confusion, but Cassie is the protege and collaborator asked for here. The song was released in 2009, during the period when Cassie and Diddy were also publicly linked romantically.