Teen music/acting starlets Miranda Cosgrove and Victoria Justice will take the same stage when their respective Nickelodeon shows, 'iCarly' and 'Victorious,' are impounded into one spectacular mash-up episode!

Not only will the casts come together, but Cosgrove and Justice will share the mic in a collaborative song, ‘Leave It All to Shine,' which is actually a mix of the two shows' theme songs. Both casts will take the stage during the 'iParty with Victorious' episode to give a huge ensemble performance of the new tune.

While the Cosgrove/Justice collab is incredibly epic -- and we're stoked for the episode -- it's not the first time that the girls have put their heads together. As of late, the 17 and 18-year-olds have been using their star power to raise money for the St. Jude’s Research Hospital. The pair, with their casts in tow, will attend a fundraiser for the hospital at Peabody Hotel in Memphis, Tenn. on May 14.

The 'iParty with Victorious' cast mash-up episode airs on Nickelodeon on Saturday, June 11 at 8PM ET.

Watch the 'iCarly' Cast and the 'Victorious' Cast Collide on 'Leave It All to Shine'

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