The two women introduced their boyfriends, Machine Gun Kelly and Travis Barker, at the MTV VMAs, and made a remark that fans had a lot to say about.
The "KUWTK" star and Blink-182 drummer officially confirmed they were dating in February.
The couple's 18-year age gap was the subject of much discussion among fans and Hamlin's own mother, "Real Housewives" star Lisa Rinna.
Disick apparently attempted to commiserate with another of Kardashian's exes about her PDA-heavy new relationship with Travis Barker, and it majorly backfired.
But her big sister Kourtney Kardashian said her memory differed.
The couple hit a PDA TKO in May when fans found footage of the Blink-182 drummer sucking her fingers at another UFC fight.
His ex-wife Shanna Moakler claimed that she ended their marriage because he cheated on her with Kardashian.
The new couple are making their love public and permanent.
"This is so beautiful. I've never seen anything like this," Kim Kardashian said of the extravagant gift.
The Blink-182 drummer debuted some new ink on Instagram Friday that seemed to illustrate his desire for permanence with his girlfriend.