Guests at Kim Kardashian West's birthday party were given fake baby bumps.

Kim Kardashian West

Kim Kardashian West

The 'Keeping Up With The Kardashians' star - who is expecting her second child, a son, with husband Kanye West - was thrown a surprise party yesterday (21.10.15) to mark her 35th birthday and has revealed she was made to feel right at home when everyone showed up with a bump.

Sharing details on Twitter, she wrote: "He [Kanye] rented out the entire movie theater to screen the new Steve Jobs movie (it's soooooooo good btw)

"He had all of my family & close friends come dressed up as their best pregnant Kim look (fake baby bumps provided on arrival!) (sic)"

And the 35-year-old star - who also has two-year-old daughter North with the 'Bound 2' rapper - admitted the "fun cool theme" made her feel "so very comfortable".

She added: "Not sure if that was to make me feel less huge or just a fun cool theme but I loved it & had the best time ever!

"Feeling so very comfortable eating churros with a bunch of pregnant women! Just what I needed, the perfect chill yummy food birthday!!!! (sic)"

Kim took to Twitter to show off her stunning three-tiered cake, which was decorated with white flowers and had a sign reading, 'Happy Pregnant Birthday Kim,' placed on it.