Colin Kaepernick Dating MTV Star

San Francisco 49ers QB Colin Kaepernick has finally gone public with his new relationship ... with MTV "Girl Code" star, Nessa.

Sources close to the couple tell TMZ Sports the two have been dating for months ... but they finally surfaced as an official couple this weekend at a Valentine's Day charity event.

Colin and Nessa attended the Valentine Hearts fundraiser to benefit Camp Taylor -- a free camp for kids battling heart disease -- where they spent hours hanging out with the campers!