Trevor Lawrence is having the BEST offseason ... just days after he inked a massive contract extension with the Jaguars, the quarterback and his wife revealed they're now expecting their first child together!
Trevor and Marissa -- who got married three years ago -- made the announcement in a joint statement on their Instagram pages on Thursday ... sharing pics of them holding a sonogram.
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"A little Lawrence on the way ud83eudd0d," Marissa said in the caption.