The 44-year-old has already checked off some major tasks on her to-do list, including choosing wedding bands, setting a date and narrowing down dresses, reported People magazine.
The ceremony is likely to take place soon after Aniston wraps up her current film in Connecticut on March 8.
"It will be a small affair with their closest friends," a source close to Aniston said.
The source also added that Aniston is more than confident about her relation.
The former 'Friends' star was previously married to actor Brad Pitt for six years.