Christina Aguilera has found the funny side of her Super Bowl National Anthem slip-up in new ads for her upcoming talent show The Voice.
The singer and fellow mentors Blake Shelton, Cee Lo Green and Adam Levine all take turns in recalling their most embarrassing moments at the mic - and Aguilera offers up forgetting the lyrics to the Star Spangled Banner at the 2011 Super Bowl.
She says, "I think I've got one that'll top it all... I've slipped a little, tripped a little but I forgot the lyrics to the National Anthem at the Super Bowl. I take the cake."