Movie star Chris Pratt has confirmed he will be visiting Boston's Christopher's Haven centre in costume as his Guardians Of The Galaxy character after losing a Super Bowl bet to Captain America Chris Evans.

Pratt, who played Starlord in the blockbuster last year (14), was gracious in defeat as his Seattle Seahawks lost the big game to Evans' beloved New England Patriots.

Both movie superheroes were at the game in Arizona, and shortly after the final whistle, Pratt took to Twitter to admit defeat.

He wrote, "Congrats to the world champions @patriots you were the better team tonight. I will be visiting @chris_haven as Starlord."

The two pals made the sports bet last month (Jan15), agreeing the loser would have to visit a children's hospital of the winner's choosing in character.

Good guy Evans responded to Pratt by insisting he'd visit a children's hospital in Seattle, Washington - even though he won.

He wrote, "Thank you to @prattprattpratt for being a good sport. I'll be there with you at @chris_haven, and don't worry @seattlechildren, we'll be coming there too!"

Christopher's Haven medical facility provides a home for kids battling cancer.