Actress Reese Witherspoon has laughed away stories of stresses between her and Vince Vaughan upon the filming of their merry motion picture "Four Christmases". The 2 superstars act as lovers in the recent motion picture, only rumors indicate anything but lovemaking between them in the middle of takes. And the scuttlebutt has kept going as they publicize the recent motion picture, since they are modeling for individual interviews. Only Reese Witherspoon is baffled by the speculation - since she had an outstanding time with Vaughn when they filmed the comedy. And the superstar, who's going out with Jake Gyllenhaal, takes a firm stand the rumor mill moves into extra time if she's paired up with a great Hollywood actor. She contributes, "Every co-star I always act with, I am either undergoing an involvement with him, I am close to getting hitched with him, or having a baby, or we utterly can't tolerate one another.