Christina Haack and Josh Hall Rock Couples Costume for '70s-Themed Party

Photo: Christina Haack Instagram

Christina Haackis getting groovy with her fiancé.

“Heading out to that 70s party 💿 ✌🏼,” Haack captioned the snap. She also shared a video to her Instagram Stories of a shirtless Hall showing off some of his costume — and his retro dance moves (below).

Christina Haack Instagram Stories

The couple’s latest outing comes two weeks after theyannouncedtheir engagement while vacationing in Los Cabos, Mexico, in late September.

Hall popped the question with anemerald-cut ringfrom Los Angeles-based jeweler Benny and the Gems, which Haack showed off in a smiling selfie from the trip. The relationship milestone came two months afterPEOPLE confirmedHall and Haack were dating in July.

christina haack/ instagram

At the time, a source told PEOPLE Haack and her new man had “an immediate, real connection” from the start.

“They’ve enjoyed getting to know each other one-on-one without outside noise,” the source added.

TheChristina on the Coaststar laterrevealedshe had been seeing the Austin-based realtor since the spring, but kept their relationship secret for months.

“I met Josh when I wasn’t in a state of fear or fight-or-flight,” she wrote onInstagramin July. “When we met this past spring, the synchronicities hit us so hard and fast they were impossible to ignore. I felt immediately crazy protective over him and wanted to keep him for myself and get to know each other before the tornado (media attention) hit.”

Christina Haack/Instagram

Since the couple took their relationship public, Haack has shared plenty of their adventures with her followers, including Hall’svisitsto her new Tennessee home,family tripswith her now-fiancé, and veganlunch datestogether.

Just before revealing her engagement, Haack posted a sweet birthday message for Hall onInstagram.

source: people.com