Claim: Mackenzie Foy portrayed Renesmee Cullen.

Mackenzie Christine Foy -LRB- born November 10 , 2000 -RRB- is an American model and actress . She is best known for her role as Renesmee Cullen in the 2012 film The Twilight Saga : Breaking Dawn -- Part 2 , which earned her a Young Artist Award nomination as Best Supporting Young Actress in a Feature Film , and as the young Murphy in the 2014 space epic Interstellar , for which she received critical acclaim and several awards and nominations .