It's summer once again. Time to show off the results of hours spent working out in the gym!  That’s what actress Nina Dobrev and supermodel Doutzen Kroes did while on separate summer holidays, enjoying the cool waters of the sea.

Dobrev took to Instagram Tuesday to show off her sexy body and summer adventures with friends, E!News reported.  The former “Vampire Diaries” actress uploaded a fun snap of herself with girlfriends while aboard a yacht. One fan wrote “I LOVE U SO MUCH!!!" while another commented, "U guys r so pretty… i wish i could meet u."

Dobrev also shared a video clip that showed her going down a slide head first and on her back.  She captioned the video, “Here's to never growing up! Bye Felicia.” 

The actress also wore different swimsuits in the two Instagram posts; one was a two-piece bikini while the other was a black one-piece suit with an elaborate and strappy top.

The star’s amazing bikini body is a result of her hard work with trainer Steve Moyer, coupled with Dobrev’s love for spinning, volleyball, running and surfing, stated Hollywood Take. In a previous interview with Shape, Moyer said the actress’ program is focused on core work and all-around fitness.

Meanwhile, supermodel Doutzen Kroes turned heads while enjoying a splash in the beach, the Daily Mail reported.  Kroes flaunted her toned figure in a bright multi-colored two-piece swimsuit that showed off her svelte body. The mother of two seemed to have placed more emphasis on doing crunches, since she sported a very impressive sixpack.          

The former Victoria Secret model was on a romantic holiday in Ibiza with husband DJ Sunnery James, who was also working the party scene in the area.