The launch of is designed to give the title a more interactive dimension, with staff contributing blogs and readers able to create their own profiles and comment on stories.
It will also bring in valuable digital advertising revenue for Emap, with Rimmel London and Impulse already signed up as sponsors.
Kurt Edwards, digital head of sales, said: "Heat is unique and a huge brand that offers advertisers a trusted environment in a very busy women's market. Its magazine, radio, mobile and online presence will allow us to deliver some exceptional campaigns and commercial opportunities."
The editorial aspects of the site will be overseen by Julian Linley as digital editor.
The site was designed by digital agency Splendid and conceived by Heat's editor-in-chief Mark Frith and Emap Entertainment's digital business director Rebekah Billingsley.
Emap said its goal is for the website to become the number one online source for celebrity gossip.
It is not the first gossip magazine to have an online presence, having been beaten by IPC's , while its sister Emap title Closer is represented by the website.
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