"Fergie is a huge Guns 'N Roses fan - one of her career highlights has been performing and recording with Slash - so Axl makes perfect sense," a source close to the singer tells Us Weekly.

The rocker also gushed about her love for the band just one year after her fall 2009 nuptials with Duhamel. "Some of my biggest vocal idols are rock and roll. I mean Sebastian Bach, Vince Neil, Axl Rose, Robert Plant," Fergie exclusively told Us in September 2010. "These are people that I have emulated vocally."