Pop/R 'n' B singer Stacy Ferguson a.k.a. Fergie showed to her fans that she has the thing for rock music by tapping Velvet Revolver and ex-Guns N' Roses' guitarist Slash at one of her concerts on July 19. On the show held at Pacific Amphitheatre in Costa Mesa, California, Fergie and the renown guitarist collaborated on two rock songs, GNR's hit track "Sweet Child O' Mine" and Heart's "Barracuda".

Before collaborating, Fergie introduces Slash to the crowd, saying, "Some of you little ones may know him from 'Guitar Hero', but I know him from a band called Velvet Revolver and a band called Guns N' (bleeping) Roses!" Their collaboration was also caught on video by a fan and has been streamed via YouTube on July 20.

Unfortunately, her bold effort on performing two famous rock tracks received critics from The Orange County Register writer Kelli Skye Fadroski who suggested that Fergie should stay out of rock music. "Despite the acrobatics, Fergie should stick to doing what Fergie does best - pop-tart tunes-and stay away from rock," Kelli said.

Meanwhile, the R 'n' B singer who is also one of the members of Black Eyed Peas, is still promoting her re-released record "The Dutchess [Deluxe Edition]", outed on May 27. On the repackaged LP, she added four new tracks that weren't available on the original version. Those songs were, "Labels or Love", "Barracuda", "Party People" featuring Nelly and "Clumsy.

Check out Fergie featuring Slash performing "Sweet Child O' Mine" live video: