Ariana Grande will sing the national anthem inside the stadium as the Seattle Seahawks plays against the Green Bay Packers.
Grammy Award-winning band Soundgarden will also kick off the free event.
In addition to the NFL gig, Williams has been announced as a part of the lineup for the 2014 iTunes Festival which will take place in the UK in September, joining other performers such as Maroon 5 and Sam Smith among others.
Grande, meanwhile, is gearing up for the release of her album new album My Everything which is scheduled to arrive in stores on August 25.
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