Cody Simpson's girlfriend Gigi Hadid is not only the daughter of 'Real Housewives of Beverly Hills' star Yolanda Foster, but she is now a certified 'Sports Illustrated' swimsuit model. 

The 18-year-old beauty modeled bikinis in the magazine's 2014 50th anniversary issue, and her boyfriend couldn't possibly be any prouder of his lady love.

"I saw [the pictures] for the first time this morning," Simpson, 17, told Us Weekly yesterday, Feb. 18. "We were together and the photos came out online and I'm just so excited for her. I'm so proud of her. It's unreal."

Despite her stunning looks, Hadid was (understandably) anxious about seeing herself in the issue for the first time -- after all, modeling for the 'Sports Illustrated' swimsuit edition is a huge deal. But Simpson -- who should win the award for sweetest BF ever -- was more than confident that his girl would look flawless.

"She was like, 'I hope I look good!' And I was like, 'Babe, you look amazing all the time,'" the singer recalled. "She's one of the most beautiful girls ever."