no
no john cena has never won a Grammy
No
Of course! He's won the most Grammy's ever in HIStory!
Demi Lovato has never won a Grammy
yes
Yes, they won 1 in the 2011 Grammys. :)
Grammy Lifetime Achievement Award - as a solo artist in 2012
Naw dipp Sherlock
yes a bunch !
No but she does have two nominations.
3
They won a Grammy in 1999 when I Want You Back was entered into the Hall of Fame for it lyrics.