Ashley Greene joins Garner's 'Butter'

Ashley Greene has signed up to appear alongside Jennifer Garner in Butter, says The Hollywood Reporter.

The Twilight actress will play high schooler Kaitlen Pickler in the comedy, which centres on the contestants of a butter-carving competition at the Iowa State Fair.

Jason A. Micallef's Butter script is said to be inspired by Hilary Clinton and Barack Obama's rivalry to win the Democratic Party's nomination for president in 2008.

The film goes into production next week under the stewardship of She's Out Of My League director Jim Field Smith.

Ty Burrell and Rob Corddry are also among the cast.