ET was on the ground for Super Bowl media day in Arizona on Tuesday, testing some of the toughest football players on the planet about their knowledge of halftime artist Katy Perry.
ET's Kevin Frazier and special correspondent Michelle Williams got stars from both the New England Patriots and the Seattle Seahawks to sing some of Katy's biggest hits, and even got Seahawks running back Marshawn Lynch to bust out a tune.
"Maddie, it's always a pleasure. You're such a sweetheart," Russell said. "Thank you for everything you do and thank you for rooting for us. I'm praying for you to go strong against cancer. I know you'll come through and I'm rooting for you, girl."
Seahawks cornerback Richard Sherman got a message from Yvette, the sister of his best friend who died after getting caught in the crossfire of a gang shootout on the streets of Compton.
"We'll be cheering you on from San Diego," Yvette said. "Go Seahawks!"