Lady Gaga will serve as the mentor during next week's performance episode of 'American Idol.' Gaga will offer her advice and guidance to the Final Four contestants: Scotty McCreery, Haley Reinhart (who sang Gaga's currently unreleased 'You & I' last week), James Durbin and Lauren Alaina.

The remaining quartet of hopefuls will be performing songs penned by Leiber & Stoller, a songwriting team responsible for classic cuts like 'Jailhouse Rock.' The performance episode will air on Wednesday night.

Gaga has appeared on 'Idol' before in a performance capacity. She sang her hit 'Alejandro' from 'The Fame Monster' last May.

A tweet was posted by the show's official Twitter account which read as follows: "Next week, @LadyGaga will mentor top 4 who perform songs by Leiber & Stoller. @TheRealJordin Sparks performing, @IAmStevenT debuting video."

Host Ryan Seacrest also confirmed the good news, tweeting: "I only have one word for our mentor on @AmericanIdol; next week.......... Gaga."

As the 'Idol' tweet indicates, Jordin Sparks, the Season 6 winner, is returning to perform next week. As crunch time rolls around on Season 10, the stakes are higher, the mentors are more prolific and the performances are getting better.

Watch Lady Gaga Perform 'Alejandro' on 'American Idol' Last Year