It was the battle of the birds ... Cardinals vs. Seahawks ... and Jordin Sparks let hers fly right in the direction of a Seattle fan this weekend -- and TMZ Sports has the pic.
Sparks -- a die-hard AZ Cards fan -- was singing the National Anthem at University of Phoenix Stadium in Glendale this weekend ... when a fan in a Seahawks beanie got her attention.
We're guessing there was some smack talk between the two sides ... and it culminated in a pretty solid one-finger salute from the former "American Idol" champ.
In the end, the Seahawks fan got the last laugh ... Richard Sherman and company shellacked the Cards 35 to 6.
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