The cat's out of the bag. While the Black Eyed Peas are slated to perform during this Sunday's Super Bowl halftime show, organizers have a few more tricks up their sleeves, with inside sources claiming that R&B sensation Usher and former Guns 'N Roses guitarist Slash have been scheduled to make surprise appearances during the BEP show.

The surprise guests, which were not supposed to be announced, each have connections to the stars of the gig. Usher has previously collaborated with on the international smash 'O.M.G.,' while the frizzy-haired guitarist laid down a track dubbed 'Beautiful Dangerous' last year with Fergie. This marks the first time that either artist has appeared during the prestigious Super Bowl halftime show.

The Black Eyed Peas previously announced that they would be keeping it clean during the performance, excluding 'My Humps' from their megamix. Fans can expect the quartet to perform 'I Gotta Feeling' during the show, set to air halfway through the Green Bay Packers vs. Pittsburgh Steelers game on Sunday beginning at 6:30PM.

Watch Usher's 'O.M.G.' feat.

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