Scott Disick and Sofia Richie make their first official appearance as a couple

Scott Disick & Sofia Richie Seen 'Kissing All Night' During First Official Event as a Couple

Their relationship heats up! - by Becky Randel

After proving they are most certainly still together earlier this week in Miami, Scott Disick and Sofia Richie continued their romantic vacation Wednesday night in the Magic City.

The twosome, who are in town for Art Basel, attended a glamorous party for DuJour magazine, of which Richie is currently the cover star. The couple arrived together at the Confidante Hotel, and although Richie posed solo on the red carpet, the lovebirds were seen, “chatting and kissing throughout the night,” sources tell PEOPLE.

Witnesses say Richie and Disick were “very touchy” as the 34-year-old Keeping Up with the Kardashians star supported his 19-year-old girlfriend and her budding modeling career. The couple coordinating their looks — she in a body-hugging, long-sleeved black mini dress and he in black pants and a black button-down exposing his chest.

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The duo circulated the event together, posing for pictures, talking to guests, and laughing with DuJour publisher Jason Binn and former Miami Beach mayor Philip Levine.

More than 700 guests — including Karolina Korková, Paul Shaffer, Michael Bay and Sammy Sosa — attended the affair, which took place poolside at the boutique hotel.

This article originally appeared on PEOPLE