But Kourtney Kardashian seemed to be getting a head start yesterday.
The reality star was seen running errands, literally, as she jogged around Beverly Hills and bought herself a bright green vegetable smoothie.
Running errands: Kourtney Kardashian was jogging around Beverly Hills, wearing her own line of clothing with the slogan 'KK In The City'
Fighting the festive bulge: Kourtney seems to be keen to lose any extra Christmas weight as she launches into a run
Mmm... appetising! Kourtney has a green shake that looks like a veggie smoothie
Despite the slightly off-putting shade, Kourtney relished her drink and tweeted her followers about the hearty option.
After a fan wrote to her asking if she had tried the concoction, she wrote: 'I had one today! So yummy! RT @Manda4dmb: @KourtneyKardash have you tried kale smoothies??! To die for.'
Detox: Kourtney tweeted about her Kale smoothie, saying it was 'yummy'
She also replied to a tweet from a girl who said she had just had a wheat grass shot, quipping: 'I need that!'
The mother-of-one is currently pregnant with her second child to Scott Disick, so it's no wonder she may have a few little odd cravings.
However, pregnant Kourtney recently revealed she is having trouble consuming as much compared to when she was expecting Mason, two.
She said: 'I'm just eating whatever I can, whatever I can tolerate.'
Perhaps Kourtney is gearing up for the family secrets about to be spilled.
The Kardashian ex-nanny is reportedly hoping to release a tell-all book.
Pam Behan, who served as PA and cook for the household prior to them finding fame, promises to unveil 'intimate details' of the famous siblings.