Khloe Kardashian poses with nieces Penelope Disick and North West at nephew Mason Disick's Bar Mitzvah bash

The Kardashians producer-star Khloé Kardashian attempted to get a good shot of herself with her two nieces during her 13-year-old nephew Mason Disick's Bar Mitzvah at Offsunset in West Hollywood on Saturday.

The 38-year-old Calabasas socialite's 10-year-old niece Penelope Disick smiled politely for the snaps while her nine-year-old niece North West refused to sit still and pulled several faces.

Khloé - who boasts 343.2M social media followers - captioned her Instagram slideshow: "Mazel tov Mason! The girls and I attempted to take some pics."

Kardashian - who won best reality TV star at the People's Choice Awards - was later seen leaving the family festivities with little North and Penelope in tow.

The Good American co-founder slipped her shrinking 5ft10in figure into a black turtleneck catsuit with attached heels and gloves selected by stylist Dani Levi.

Make-up artist Ash K. Holm fully contoured Khloé's complexion and hairstylist Andrew Fitzsimons coiffed her dark blonde waves - without the fake clip-in bangs she wore last Thursday.

Skipping the family function was Kardashian's four-year-old daughter True Thompson.