Marti plays Sandy the Dog in the upcoming remake of the Broadway classic Annie - find out more about her life and work here.
Directed by Will Gluck, Annie stars Quvenzhané Wallis, Jamie Foxx, Cameron Diaz and Rose Byrne.
Studio Sony Pictures says: "Academy Award nominee Quvenzhané Wallis (Beasts of the Southern Wild) stars as Annie, a young, happy foster kid who's also tough enough to make her way on the streets of New York in 2014.
"Originally left by her parents as a baby with the promise that they'd be back for her someday, it's been a hard knock life ever since with her mean foster mom Miss Hannigan (Cameron Diaz).
"But everything's about to change when the hard-nosed tycoon and New York mayoral candidate Will Stacks (Jamie Foxx) – advised by his brilliant VP, Grace (Rose Byrne) and his shrewd and scheming campaign advisor, Guy (Bobby Cannavale) – makes a thinly-veiled campaign move and takes her in.
"Stacks believes he's her guardian angel, but Annie's self-assured nature and bright, sun-will-come-out-tomorrow outlook on life just might mean it’s the other way around."
Annie is released in cinemas on December 20.