Here are three things you should know about tonight's 'Glee' episode,"Tina in the Sky with Diamonds." Check out what we already know about this week's 'Glee,' before it even airs. Check out the picture above of Adam Lambert and Demi Lovato rocking out on the Glee set along with Santana (Naya Rivera), Rachel (Lea Michele) and Kurt (Chris Colfer) in New York City. Lea posted the pic earlier this week.
Though Adam won't join Glee for two more episodes, Demi will make her debut tonight. Here's what we know already about this week's show:
3. The Beatles Hits Keep Coming
Glee returns this week with more Beatles hits that explore their "experimental years." As New Directions gets ready to dominate at Nationals, they continue their tribute to the Fab Four with more classic hits, including "Revolution."
2. It's Prom
It is prom this week and Kitty (Becca Tobin) and Tina (Jenna Ushkowitz) go head-to-head as they both vie for the title of prom queen. Tina's new competitive and fierce attitude alienates some of her friends, and the race ends up bringing out the worst in Tina and Kitty. Can we say mean girls?
1. Demi Lovato Comes to Glee
Demi Lovato is finally making her Glee debut as Dani, a singing waitress who plays the guitar. She quickly catches Santana's eye at the diner and the two become an item and even share a smooch!
Need more Glee? Check out the promo below for tonight's show: