Diddy's twin daughters flaunt their midriffs during a hike with Kourtney K. & kids

Kourtney Kardashian and friends hit the trail on a nature hike in Malibu

Kourtney Kardashian and Larsa Pippen took their children out for an invigorating hike in the hills of Malibu, California, and along for the ride were D'Lila Star and Jessie James Combs, and the group posed for a photo latter posted on Instagram.

The two girls are the offspring of Kimberley Porter and American rapper, singer, and songwriter Sean John Combs - also known by his stage names Diddy, or Puff Daddy.

The two are twins and have just turned 12, and are on their way to becoming terrible twin teens. The girls wore skin-tight leggings and sassy tops that left their slim mid-drifts bare.

Kourtney, 39, wore a black and white Adidas jacket with a white crop top, black leggings, and matching black sneakers. She finished off her look with navy a blue baseball cap and snappy sunglasses.

Kourtney wore her long hair loose around her shoulders and gave her youngest son, Rein, 3, a piggyback ride. Kourtney shares two more children with actor Scott Disick - another son, Mason, eight, and daughter Penelope,

Penelope wore a white t-shirt and long black pants and was photographed hugging a cute black dog that was on a leash. Her brothers wore longsleeved black sweaters and black pants.

Larsa Pippen, 43, is Kourtney's best friend and the two often share quality time with their children. Pippen is a reality star from the show The Real Housewives of Miami and is married to Scottie Pippen, a former professional basketball player who played for the Chicago Bulls with Michael Jordon. The couple share four children: Sophia, Justin, Preston, and ScottyJr.