Last night marked another legendary Summer Jam tailor-made for hip-hop's history books. Hot 97’s annual concert celebrated its 20th year in a big, big way. Lil Wayne, Rick Ross, Nicki Minaj, Mariah Carey, Lil Kim and more were just a few names in the list of surprise guests throughout the evening. True to its importance, this year’s show also boasted prominent rap stars, as well as a few controversial moments that couldn't go unnoticed. Here’s a breakdown of the 16 biggest moments from Summer Jam XX, from Wu-Tang Clan’s solid set to Papoose’s head-scratching appearance.