Heidi Montag shows off her bump in a floral print string

Heidi Montag shows off her bump in a floral-print string bikini during a beach day in Hawaii

Heidi Montag flaunts her bump in a floral-print string bikini during a day at the beach in Hawaii…while awaiting the arrival of baby number two

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She’s waiting for baby number two to arrive.

And Heidi Montag showed off her blossoming belly as she enjoyed another beach day in Hawaii on Tuesday.

The Hills star, 35, wowed in a tropical print string bikini as she basked in the sun.

Hello mum!  Heidi Montag showed off her blossoming belly as she enjoyed another beach day in Hawaii on Tuesday

Hello mum! Heidi Montag showed off her blossoming belly as she enjoyed another beach day in Hawaii on Tuesday

The mom-to-be couldn’t have looked happier as she gently placed her hands on her burgeoning belly and the wind whipped through her blonde hair.

She walked barefoot along the shore, beaming with happiness and happily throwing her arms in the air.

She appeared to have a touch of makeup gracing her glowing complexion, with a peachy shimmer and a touch of eyeshadow complementing her face.

Heidi gave fans more behind-the-scenes insight into her pregnancy on social media, where she revealed she smeared coconut oil on her stomach to prevent stretch marks.

beach babe!  The Hills vet looked stunning as she strolled barefoot through the blue ocean

beach babe! The Hills vet looked stunning as she strolled barefoot through the blue ocean

Yay!  Montag flashed a big grin and threw up her arms in glee

Yay! Montag flashed a big grin and threw up her arms in glee

“I used coconut oil. It’s not that expensive, it’s organic… Yes, that belly is getting really big!’ she exclaimed.

Subsequent snaps showed more of her Hawaiian vacation with husband Spencer Pratt, whom she met while filming The Hills and wed in 2008.

She shared a boomerang clip of them sharing a hickey by the sea. “Love you @spencerpratt,” she wrote in the clip.

Tips to share: Montag shared with fans that she had been using coconut oil to prevent stretch marks

Tips to share: Montag shared with fans that she had been using coconut oil to prevent stretch marks

XOXO: The MTV alum shared a kiss with her husband Spencer Pratt, who she has been with since their The Hills days

XOXO: The MTV alum shared a kiss with her husband Spencer Pratt, who she has been with since their The Hills days

Heidi also posted a glowing snap of her posing on the beach at sunset with her hand resting on her stomach.

“One of our last nights and I’m so sunburned,” she said.

In June, Heidi and Spencer announced they were expecting their second child and later announced they were having a boy.

She initially thought she was having a girl and the blue cake at her gender reveal surprised her.

“My whole intuition was wrong,” she admitted while chatting with “Entertainment Tonight.”

She continued, “Growing up I always wanted boys and then recently I’ve started to think, I don’t know, I kind of want a girl [to have] one of each. For Gunner, he really wants a brother, so ultimately I want what’s best for him and his life.”

Sun-kissed: Montag gently placed her hand on her stomach as she soaked up the sunset

Sun-kissed: Montag gently placed her hand on her stomach as she soaked up the sunset

We all scream for ice cream!  She treated herself to a delicious ice cream during her trip

We all scream for ice cream! She treated herself to a delicious ice cream during her trip