The aspiring rapper wrestled WWE star John Cena in October to help promote his debut album, Playing with Fire, and received a resounding chorus of boos from the audience.
Spears filed for divorce from Federline last month and he has since had to downgrade his lavish lifestyle.
Federline will appear in a rematch with Cena on New Year's Eve.
Meanwhile, Spears will be making a more lucrative appearance--she is reportedly earning $250,000 to perform at Pure nightclub in Las Vegas on New Year's Eve.
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