Katie, who is pregnant with Kieran's second child, took to Twitter this afternoon (28 May) and addressed her followers with a new tweet.
Since news of Kieran's affair with Katie's BFF Jane Pountney broke, Katie has remained mostly silent, so this is a big step for the star.
Shortly after she announced the shock details in a flurry of tweets on 7 May, Katie released a statement saying that she was "heartbroken" by the cheating.
Katie's rep then thanked the former glamour model's fans on her behalf and she has since posted a series of cryptic messages on the social networking site.
Today, however, she logged on again and sent a personal message to her followers. In it, Katie tweeted three kisses, adding: "Thanks to those offering kind words. Something important to get behind on the next tweet – please RT."
Katie, who is mum to disabled son Harvey, then followed up this message with a moving charity video, saying: "Help @BlindChildrenUK tackle the challenges of childhood sight loss. Pls RT this inspirational film."
While Katie has been fairly tight-lipped since the affair news rocked the showbiz world, Kieran has spoken out and said he is "glad" that he got caught with Jane.
Chatting to The Sun yesterday (27 May), Kieran also revealed that he's currently undergoing therapy at a £2,500 per day facility in order to treat compulsive addiction.
Part of his treatment has included writing a letter to Jane, which he showed to the newspaper.
In the letter, Kieran wrote: "I was never going to leave Katie for you. I am so glad we got caught because now I can get help and I can start a new fresh life with Kate with good people in our life and positive future."
It has since been reported, however, that Katie has "kicked Kieran out" of their marital home.
Katie and Kieran, who welcomed their first child together into the world last summer, married in January 2013.