The trio were in the crowd supporting Kim's fiancé Kanye, as he continued his Yeezus tour in their hometown of LA and appeared to be having a great time - even making sure to take a cute snap to capture the moment.
Fergie and Khloe each posted the picture on their Instagram accounts, with mother-of-one Fergie writing: "Mommy bonding w/ @kimkardashian."
She also added: "@khloekardashian u crack my shiz up gurrl!!!"
38-year-old Fergie had a night off from parenting, as she partied with the Kardashians at the concert, no doubt leaving baby son Axl at home in the safe arms of his father Josh Duhamel.
The couple welcomed their little boy into the world in August and have since shared a number of cute photos of him with their fans on Twitter and Instagram.
Meanwhile, Kim also left her baby daughter North tucked up at home, while she cheered on future-hubby Kanye.
The 33-year-old gave birth to her first child in June and appears to be taking to motherhood like a duck to water.
We wonder whether she and Fergie shared a few parenting tips last night, as well as chanting Yeezus lyrics? Or maybe they set up a play date for their littluns!
What do you think of the baby name Axl? Let us know below, as the best comment each week wins £50!