FIRST LOOK: See Lindsay Lohan's Glee Guest Spot

Here she is, McKinley High!

When Glee's New Directions gang hits the stage for the Nationals competition Tuesday, they'll have to face a judge who's had all eyes on her more than once: Lindsay Lohan.

In these new promo images from Glee's May 15 episode, Lohan, clad in a black and white strapless dress, greets an auditorium full of glee club members and their fans before judging the competition alongside Perez Hilton and Rex Lee.

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"Glee was fun to do! It made me want to live in a world of musicals where people always just burst out into song & dance!" Lohan, 25, tweeted Monday, two weeks after she was slammed as a "diva" on the FOX hit's Los Angeles set.

On set with the Glee cast -- including Lea Michele and Cory Monteith -- for three days, Lohan reportedly showed up hours late and angered cast and crew members with megawatt demands, which her rep vehemently denies.

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Lohan will soon take on the role of Elizabeth Taylor in Lifetime's Liz & Dick, and has vowed to bring her A-game when honoring the late actress -- critics be damned.

"I don't think I need to tell her anything," Lohan said after Rosie O'Donnell declared the actress incapable of channeling Taylor. "I know that I'm great and I know that I know Liz Taylor really well."

Glee's two-hour Nationals episode airs May 15 at 8 p.m. (EST) on FOX.

This article originally appeared on Usmagazine.com: FIRST LOOK: See Lindsay Lohan's Glee Guest Spot