Russell Wilson -- Brings Ciara to White House Dinner ... You're Welcome, Barack

Russell Wilson is having one hell of an off-season ... he just walked in to the White House State dinner with Ciara on his arm .... and she's looking DAMN FINE!!!!!

Rumors had been swirling about the Seattle Seahawks QB secretly dating the R&B singer ... but now, it appears to be official -- with Wilson bringing her as his date for dinner with President Obama and the Prime Minister of Japan.

Before Ciara came into the picture, Wilson -- who divorced his wife last year -- was spotted out with Sports Illustrated Swimsuit Edition model Samantha Hoopes ... but clearly, she's out -- Ciara's in.

Mazel!