"#GameDay! Let's go!!," she captioned the adorable photo along with Russell's jersey number #3 as a hashtag. The "Goodies" songstress wore a Seahawks jersey and beanie while at the game.
Russell, who is the starting quarterback for the Super Bowl winning team, is set to play against the Los Angeles Rams on Sunday. They currently sit 2nd in the NFC West.
Ciara gave birth to little Sienna on April 28th of last year. It's their first child together. She didn't give fans a glimpse of her baby girl, however, until almost a year after she was born.
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She also has a son named Future Zahir that she shares with ex-fiancé Future.
Sienna could be following her mommy in the dance world, as Ciara posted an adorable video of her breaking out some impressive dance moves back in September.
What are your thoughts on Ciara and Sienna's game day adventure? Sound off in the comments!