2 Works in Jessica Biel/Justin Timberlake
Lance still has a whole lot of bitterness over the fact that Justin won't admit the truth about himself. Enough bitterness to do the unthinkable at Justin's wedding.
An old friend from Chris' past calls and asks for a favor. He's always thought she was just one of the guys...but now he's not so sure.
Part of this is silly and unbelievable, but I hope you can just suspend your disbelief and enjoy. :)