Kate Bosworth and Leslie Mann have joined the cast of Goodnight Moon, the semi-autobiographical film from writer-director Elgin James. Never heard of him? Well, neither have most people, but he came out of the Sundance Director's Lab like a modern-day Frankenstein and is now making his feature debut with a promising cast.

The story sees the already-cast AnnaSophia Robb and Juno Temple as two runaways to Los Angeles who find themselves in difficulties after forming new friendships with skaters and street kids in the City of Angels. Mann will play Temple's character's mother, and Bosworth her aunt. All we know about their roles is that Mann works in a second-hand clothing store and "her best days are behind her" - which seems a little harsh to us, but there you go.

Chris Coy (True Blood)  and Kyle Gallner (Smallville) have also joined the cast; Coy as an "an opportunistic, sociopathic street kid" and Gallner as a skater.

The film should at least be authentic; director James started a street gang in his younger days in the Boston area before heading to Sundance and a feature career. Shooting starts on Sunday near the Salton Sea in the California desert before settling in LA.