Mariah Carey, Nicki Minaj and Lil Kim were among the stars who made surprise appearances at the Hot 97 Summer Jam concert in New Jersey on Sunday (02Jun13). The Hero hitmaker joined R&B singer Miguel to perform their new collaboration #Beautiful, while rappers Minaj and Kim hit the stage with 2 Chainz and Fabolous, respectively. Other artists at the 20th annual event included Wu-Tang Clan, Kendrick Lamar, A$AP Rocky and Chris Brown.