Ciara didn't let a road trip to Washington prevent her from celebrating her man's birthday ... 'cause the pop star serenaded Russell Wilson for his 33rd -- and she brought cupcakes for the occasion too!
The NFL superstar had to hit the road for his cake day this year as the Seahawks are set to take on the Washington Football Team on Monday night -- but his talented wife made sure his big day got off on a positive note nonetheless.
Ciara sang him "Happy Birthday" in his hotel room ... and she even brought him out a grip of candle-lit sweet treats as well!!
Wilson clearly loved the gestures ... he leaned in for a big kiss from his wife, blew out the candles, and later wrote on his Instagram, "I love when u sing to daddy 😉🤣❤🙌"