Katharine, 35, shared a variety of photos from her big day with David, 68.
The "Over It" singer in front of a dramatic painting in one of the wedding snaps.
Katharine put in a big smile inside her limo while wearing her custom made Zac Posen dress in another shot.
The newlyweds said their "I Do's" in London in front of several loved ones on June 28.
They jetted off to Italy for their romantic honeymoon days later.
Katharine shared several PDA-filled Instagram stories of their time in the European country.
This is Katherine's second marriage and David's fifth. He was previously married to Real Housewives of Beverly Hills star Yolanda Foster from 2011 to 2017.