Mackenzie Shirilla 's apparently got no shortage of male attention behind bars ... 'cause she's heard gushing in a newly surfaced prison phone call about all the guys she loves messaging from prison. Take a listen ... TMZ obtained audio of Mackenzie chatting with her mom, Natalie , about the growing list of pen pals keeping her company while she serves time ... and at one point in the convo, she can barely contain herself while talking a particular guy. "I love him. I don’t know who that is,