Demi Lovato & Neil Patrick Harris Appear on 'Leno'!

Demi Lovato shows her fierce rock side while arriving for an appearance on The Tonight Show with Jay Leno on Tuesday (September 17) in Burbank, Calif.

The 21-year-old entertainer was joined on the show by Neil Patrick Harris, who is scheduled to host the 2013 Emmy Awards this Sunday (September 22).

PHOTOS: Check out the latest pics of Demi Lovato

“He’s [mostly] the same, but maybe he’s gotten a little nicer this year,” Demi told Us Weekly about X Factor judge Simon Cowell, who is expecting his first child.

In case you forgot, the new season of X Factor is airing every Wednesday and Thursday at 8/7c on Fox!

FYI: Demi is wearing Topshop pants, jacket and shirt by Acne, and Saint Laurent shoes.