6/28/2016 6:50 AM PDT BY TMZ STAFF
It was all part of Russell’s charity event with NASCAR superstar Kasey Kahne — which raises money for the Seattle Children’s Hospital. A ton of huge stars participated including Chris Pratt, George Lopez, Anthony Anderson and more.
But the highlight was the Michael Jackson song — when the Seahawks QB took over the stage and showed off his pipes.
The singin’ was pretty good. The dancing was okay … but the fiancee — STRAIGHT FIRE!!!!!