Rap star versus ex-boy band member, how fresh is that? These two clowns are battling it out over the books they’re releasing this week.

Lance Bass and 50 Cent (real name: Curtis James Jackson III) are releasing books at the same time, and even held their launch parties on the same night. At 50′s party in New York’s Philippe Tuesday, he told the New York Daily News that Bass better watch his back. “He doesn’t stand a chance,” the rapper said as he promoted his coffee-table book, 50 x 50.

Later that night, at Bass’s own NYC launch party at hotspot Azza for his new tell-all book, Out of Sync: A Memoir, the former ‘N Sync member – who came out in 2006 to PEOPLE – hit back at the rapper.

“50′s going down, that’s all I have to say,” he joked. “50, I don’t want to playa-hate, but there’s a lot that my book has [that yours doesn't].

Including, Bass says, two things in particular: “I’m pretty sure he doesn’t have any relationships with guys in that book. And I’m pretty sure he doesn’t have any space training, either.”

I don’t want either one of these on my coffee table. I’m just sayin’. Although if I had to choose, I’d go with the dude who’d been shot nine times and survived. That would send a message to any intruders. Or guests who think about stealing my sh*t. Betta recognize.

Source: People