Kardashian has reportedly been wanting to spend more time with Tristan's oldest child, son Prince, whom he shares with ex-girlfriend Jordan Craig.
The banquet room at the Hotel Bel-Air was transformed into a magical pink wonderland for the afternoon soiree.
"The shower is very pink with thousands of pink flowers everywhere, including hundreds of stems hanging from the ceiling that create an awesome first impression as guests walk in". Pink balloons were scattered on the floor, while a large neon sign that read "Baby Thompson" was placed on a wall.
Of course the event played out across various Instagram and Snapchat accounts, so here we've rounded up the best snaps from inside the star-studded event.
However, she did admit earnings on the family reality show are linked to appearances, meaning Kendall and Rob - who often steer clear of the cameras - are unlikely to take home as much as their siblings. Alongside two photos of herself posing with sister Kourtney Kardashian, she wrote, "So grateful to be surrounded by a handsome support system".
Family and friends attended the event and shared photos online.
Real Housewives of Atlanta star Kim Zolciak-Biermann and her daughter Brielle-Biermann were among the guest. Khloe Kardashian and her loved ones gathered to celebrate her becoming a mommy in style!
A source also told E!
The source also said that Khloe misses her regular glass of vino which she has had to give up during her pregnancy.
In her post on Instagram, the Revenge Body host wrote that she was "so grateful to be surrounded by a handsome support system". Cameras caught Khloe's reaction to the news that she would be having a girl, and she was stunned.