The former Friends star showed off her trim and toned physique as she joined friends at Hollywood's Foxtail Lounge.
Earlier in the day, she flaunted her buff figure during a stroll in the Beverly Hills sun.
In shape: Jennifer Aniston shows off her buff new body during a night out yesterdayHard as it may be to believe and to the envy of women everywhere, Aniston, who turns 40 next February, looks better now than she did a decade ago.
And with her ex Brad Pitt unveiling his fifth and sixth child this week, Aniston has some big news of her own, if American tabloids are to be believed.
U.S. magazines are in a frenzy over rumours the former Friends star is set to marry her new boyfriend, singer John Mayer.
Great shape: The 39-year-old is looking as trim and toned as everThe American edition of OK! claims Aniston is in the throes of planning the 'wedding of the year', complete with a Vera Wang gown and 'intimate ceremony' at her Beverly Hills home.
Best friend Courteney Cox is already lined up as matron of honour, according to the report, with the couple deciding on Crete as a honeymoon destination.
The publication quotes a source as saying: 'She's at an age where she is thinking with her head not just her heart.
'No way would she still be with anyone if marriage wasn't a real option.'
Here comes the bride? Jennifer Aniston, in Beverly Hills this week, is at the centre of rumours she's planning to marry John Mayer
Meanwhile, Star magazine claims the 39-year-old is planning to have a baby with Mayer, 30, whom she began dating in April.
The report coincides with the debut of Brad Pitt and Angelina Jolie's twins Knox and Vivienne on the cover of People in the US and Hello! magazine in the UK.
Star claims Aniston told friends: 'It's my turn now'.
Frenzy: Star magazine claims Aniston is planning a baby, while OK! declares wedding bells are ringingHowever US Weekly has weighed in on the stories, run