Scarlett Johansson and Blake Lively are apparently slugging it out to star in outer space thriller Gravity.
Both actresses have tested for the lead role of a female astronaut lost in space, said Heat Vision Blog, and a decision for the part - once offered to Angelina Jolie - is expected to be made within weeks.
Marion Cotillard has also auditioned, but the trade site taps Gossip Girl star Blake and Iron Man 2 actress Scarlett as more likely candidates.
Robert Downey Jr is already attached to star in the film, which revolves around astronauts repairing the Hubble telescope hit with an avalanche of satellite junk. The surviving female astronaut has to fight her way back to Earth, to be reunited with her daughter.
Filming for Gravity, directed and co-written by Alfonso Cuaron, is expected to kick off in 2011.
Blake is shaking off her teen drama status and showing off her acting chops, following her role in Ben Affleck's crime drama The Town and superhero movie Green Lantern.
Scarlett - who is married to fellow actor Ryan Reynolds - recently shone on screen as the Black Widow alongside Robert in Iron Man 2, and made her highly praised debut on Broadway in 2009, in Arthur Miller's A View From The Bridge.