Jon Hamm is in talks to star alongside Natalie Portman in the astronaut drama 'Pale Blue Dot'. The 47-year-old actor - who is best known for his role as Don Draper in 'Mad Men' - will play Portman's fellow astronaut alter-ego according to a Variety report. Portman took over the role from Reese Witherspoon after she walked away from the role in the Noah Hawley-directed movie in November last year due to a scheduling conflict.