Demi Lovato: 'Tonight Show' Appearance - Watch Now!

Demi Lovato gets catty during her appearance on The Tonight Show with Jay Leno on Tuesday (September 17) in Los Angeles.

“He’s [mostly] the same, but maybe he’s gotten a little nicer this year,” the 21-year-old actress/singer recently told Us Weekly of her fellow X Factor judge Simon Cowell.

PHOTOS: Check out the latest pics of Demi Lovato

In case you missed it, check out this snippet of Demi and Naya Rivera‘s duet of “Here Comes the Sun” from the new upcoming season of Glee!

FYI: Demi is wearing Topshop pants, an ACNE shirt and jacket, and Saint Laurent shoes.