The pair tied the knot in front of friends and family in Lake Como, Italy, over the weekend.
"Hello all! I've been quiet as I've been having the best few days of my life in Italy marrying @jackmcmanus. I'm so happy to be Mrs McManus!" she tweeted.
The couple, who got engaged nine months ago after four years of dating, have signed an exclusive deal with Hello! magazine to print pictures of the wedding.
McCutcheon's former best friend Kim Crawford quit her role as chief bridesmaid back in August, branding the actress "evil, nasty and vindictive".
The ex-EastEnders star had apparently told Crawford that her husband had cheated on her, which she called "malicious lies".