Nick and Vanessa Lachey at Marquee The Star in Sydney, Australia. Credit: James Morgan

Nick and Vanessa are down under!

Proud parents-to-be Nick and Vanessa Lachey stepped out to celebrate the opening of Marquee, The Star, Sydney in Sydney Australia Thursday night.

In their first red carpet appearance together since Nick, 37, announced in early March that he and his wife of 8 months are expecting their first child, the happily married pair were dressed to the nines and beaming non-stop at the star-studded event. (Ashlee Simpson, Joe Jonas, Kellan Lutz, Wilmer Valderrama and Minka Kelly were also in attendance.)

While Nick looked dapper in a tailored black suit with a black shirt, Vanessa showed off her bump and her legs in a short, loose-fitting black and white chiffon frock paired with patent Christian Louboutin heels.

On March 21, the Winter Wipeout host tweeted her hopes and wishes as she goes through her pregnancy.

"I'm very excited either way, but I always wanted a boy first," the 31-year-old posted to her Twitter account. "Just a healthy baby."