Kendall Jenner wears "Turquoise Bikini” in Malibu, California

He became a big brother for the first time last weekend.

And Kendall Jenner is making sure that her adorable nephew Mason doesn't feel left out following the birth of Kourtney Kardashian and Scott Disick's second child, Penelope Scotland.

The 16-year-old model spent yesterday entertaining the two-year-old tot on the beach in Malibu, California.

 Model figure: Kendall showcased her washboard abs in a cute turquoise bikini

Doting aunt: Kendall Jenner entertained little Mason with a day out at the beach

Fun in the sun: Kendall chased her adorable nephew up and down the beach as they played with a football

Wearing a cute turquoise bikini and sunglasses, the reality TV star chased her nephew around on the sand as they played with a football.

Little Mason looked adorable in a pair of blue and white board shorts, and looked thrilled to have his aunt lavishing attention on him during their fun day out.

Kendall also seemed to be having a whale of a time as she chased the tot around, while showcasing her enviable washboard stomach and svelte figure.

 

 Model figure: Kendall showcased her washboard abs in a cute turquoise bikini

Day of fun: The 16-year-old star played football with her cute nephew in Malibu, California

After Kourtney gave birth to baby daughter Penelope Scotland last Sunday, Mason has found himself the centre of attention among his aunts.

Earlier in the week, Khloe Kardashian took the cute youngster out for a sweet treat at a frozen yoghurt shop in Calabasas, California, while Kourtney and Scott spent some time with their newborn.

And the 28-year-old star revealed Mason is adapting to his new role as big brother perfectly.