Credit: Instagram

Real Housewives of Orange County star Gretchen Rossi and fiance Slade Smiley always have impeccable fashion sense. But we're also learning that they look great in pink onesies, too. 

On March 9, Gretchen posted photos of herself and Slade at former co-star Lydia McLaughlin's neon-themed birthday party. And the most interesting part of the photos was Slade's shocking wardrobe choice. 

"Oh yes, this happened last night!" Gretchen captions one pic. "We went to @oclydia tight-&-bright themed birthday party, and @sladesmiley & I were in it to win it! We wanted to win the costume contest! #totaldorks #lotsoflaughs #iloveathemeparty #goodtimes #funfriends."

She also posted a second photo (at right). "Yep that is @sladesmiley in my tight pink Lycra one piece outfit!! LOL! I love this man for going all the way with his costume and helping us bring home the prize for the win!!" she captions that one.

There's so much to love about Gretchen's photos! First of all, it's great to see Gretchen and Slade hanging out with Lydia and her husband Doug, given that Gretchen and Slade had friction last season over Slade's "cheeseburger" remark. Plus, we love that Slade is such a good sport about trying to win the contest. 

Are you surprised by Slade's costume? And do you think it's weird that Gretchen and Lydia are now friends? 

Source: Gretchen on Instagram