Fun in the sun!

The former Hills star, Audrina Patridge debuted her growing baby bump on Instagram — and she's never looked better!

The 30-year-old, who recently revealed that she's expecting baby No. 1 with fiancé Corey Bohan, posed in the ocean while sporting a black and blue string bikini along with a pair of stylish shades.

RELATED: See What the Cast of 'Full House' Looks Like Now!

The reality star, who got engaged to the 34-year-old in November after seven years of on-again, off-again dating, announced her pregnancy with an adorable Instagram.

"I finally figured out what to get Corey for Christmas!" she wrote.

https://www.instagram.com/p/_cMSJOwEnq/

Click through the gallery below to see what the rest of The Hills cast looks like now!