Celina announced on the micro-blogging site that she wed Peter on July 23 in a hush-hush ceremony due to family reasons.
"With great pleasure I would like to announce my wedding with Peterhaag on the 23rd of last month at a thousand-year old monastery in Austria. We seek your blessings and good wishes, and apologise for the delayed announcement due to a family tragedy...(sic)," Celina tweeted.
Peter, who is a Dubai-based hotelier, describes himself on the site as a "hotelier, marketeer, brand strategist (with) passion for luxury, hotels, fashion, photography, design, innovation nature and Apple-fanatic."
The actress also posted a picture of her with the bridegroom on the micro-blogging site.
"Beloved tweeple @peterhaag and I thank you all for your wonderful wishes & for making the occasion of our wedding so memorable... We love u all! (sic)," she said.