Seahawks Russell Wilson -- Ciara's Gonna Love ... MY NEW KICK ASS MANSION!! (PHOTO)

Russell Wilson did the impossible ... he just found a way to make Ciara's famous ass look even better -- put it in a lakeside mansion with killer views.

TMZ Sports has learned the Seahawks QB plunked down $6.7 million (of his new $88 mil contract) for the crib overlooking Lake Washington in Bellevue, WA -- and the place is insane!

7 bedrooms, 7 baths over 10,740 sq. feet ... with its own private waterfront and dock. It also has the standard stupid rich people stuff -- giant spiral staircases, chandeliers, movie theater (TV room to the rest of us), and a 1,200-bottle wine cellar.

Hell of a neighborhood too -- Bill Gates' famous spread is just 3 miles down the shoreline.