The couple gazed into each other's eyes as they attended the Black Diamond Affair presented by AZATURE at Sunset Tower Hotel on Tuesday (9 October).
Fashion Police co-host Kelly turned heads as she bared her cleavage in a flattering low-cut LBD. Teaming her dress with nude heels, Kelly rocked her blunt fringe and Heidi-style plaits on her trademark purple hair.
Making a playful pose for the cameras, the 28-year-old later held her hands up to her face while doing a shocked open mouthed expression.
Kelly and Matthew, who met in 2011, announced their engagement in July, although Kelly later admitted that they were in fact engaged at the end of December last year.
Kelly still looked to be in good spirits though, and was all smiles as she posed for photos, despite admitting earlier in the day that she had sprained her jaw.
Kelly took to Twitter and told her three million plus followers: "Nothing has hurt more than being head butted in the jaw by my bulldog William! My teeth even hurt."
"#IHaveASprainedJaw #ThisSucks," she later added.