Sooo much like Mackenzie!
TwiCrackers, meet Christie Burke who's been apparently cast as teenage Renesemee in Breaking Dawn!
Christie - aka second luckiest gal in the world (first place still goes to Kristen, natch) - appears to get to make out with Taylor Lautner in a flash-forward to Jacob and Renesemee living happily ever after...
Whether this is a Bella flash forward or when Jacob first imprints on her (as previous rumoued Lainey script deets detailed a Jacob/Renesemee montage) will remain to be seen.
According to her representation, Performers Management in Vancouver Christie is 5'7, has hazel eyes, brown hair (though her pic totes look more auburn) and weighs 115lbs (plenty light enough for Jacob to spin her around in throws of adoration, etc).
Super squishy thanks to my secret source for this info!
NB: Apparently Christies special skills also include soccar, volleyball, basketball, snowboarding, gymnastics and track & field... she must take after Rob ;)