Kim hit the beach in a tiny black bikiniCredit: Diggzy/Shutterstock

She left little to the imagination while rocking black thong bottomsCredit: Diggzy/Shutterstock

The TV personality cooled up in the waterCredit: Diggzy/Shutterstock

The 40-year-old put her impressive physique on full display as she stunned in a black bandeau top and tiny thong bikini bottoms during a beach day in Malibu on Monday.

Kim completed the look with a black baseball cap and dark sunglasses.

She was seen spending time in the water with Stephanie, who previously worked as the TV personality’s assistant.

When the friends weren’t cooling off in the water, they soaked up the sun while lying on the sand and snapping selfies.

In honor of National Daughters Day, Kim took to Instagram over the weekend to share throwback photos of herself.

She shared numerous throwback photos of herself as a teenager, posing in the garage of their old family home and in her mom’s car.

Kim wore baggy jeans and a white tee in the snaps, which caught her her posing in front of a The Simpsons arcade game and in the car.

The KUWTK star captioned the post: “I saw it was National Daughters Day so this post goes out to my mom and my daughters for when they are teenagers.”

Kim was slammed for ‘ignoring’ her kids in a National Daughters Day postCredit: Kim Kardashian/Instagram

She shares four kids with ex-husband Kanye West

While referencing her two daughters- North, eight, and Chicago, three- she joked that she hoped they would be “easy” teenagers to look after.

“North and Chi, please be easy on me when you’re the age I was in theses pics – and Mom – I’m sorry,” the reality star continued

“I remember being grounded here for Kourtney stealing your car just to drive it around the block and some how even though I didn’t participate I still got in trouble!

“So we had nothing else to do but do photo shoots in the garage. It was never me, I just listened to what my older sister said and friends.”