Music

Kitty (Becca Tobin) sings Stevie Wonder's hit "Signed, Sealed, Delivered," during Glee Season 4, Episode 21: "Wonder-ful." 

Mercedes (Amber Riley) performs a diva-tastic version of Stevie Wonder's "Higher Ground" in Glee Season 4, Episode 21: "Wonder-ful." 

Jake (Jacob Artist) shows off his dance skills with his energetic version of Stevie Wonder's "I Wish" in Glee Season 4, Episode 21: "Wonder-ful." 

Blaine (Darren Criss) joins Mercedes (Amber Riley) and Marley (Melissa Benoist) in singing "Supersition" in Glee Season 4, Episode 21: "Wonder-ful," the Stevie Wonder tribute. 

Kate Hudson is back on Glee, and for once, she's actually being nice to Rachel (Lea Michele). Here's the full video performance from tonight's Glee Season 4, Episode 21: "Wonder-ful" — the Stevie Wonder tribute — and Kate is singing Stevie's classic "Uptight (Everything's Alright)."