Scott Disick, 34, and his 19-year-old girlfriend Sofia Richie shared a passionate kiss at a restaurant on Saturday.
In front of them was a dessert plate with: 'Congratulations Scott and Sophia [sic]!' frosted onto it.
It immediately led to speculation about what the lovers could be celebrating.
In a video posted online, a waiter applauded, as friends around the two filmed.
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Keeping close: Scott Disick, 34, and his 19-year-old girlfriend Sofia Richie shared a passionate kiss at a restaurant on Saturday
Graffiti artist Alec Monopoly, a friend of Scott's, posted an Instagram Story video of this kiss, whichtook place in Miami.
Scott, who earlier this year was linked to Sofia's fellow 19-year-old Bella Thorne, has three children by his on-off paramour Kourtney Kardashian.
Their son Mason's 2009 birth was immortalized on an episode of Keeping Up With The Kardashians. A little girl called Penelope followed three years later.
Celebratory mood: In front of them was a dessert