Closer's advertising was previously handled by DDB London. The agency did not repitch for the business.
Team Saatchi will work with Closer's group marketing manager, Liz Martin, when it takes on the account in May.
Martin said: "Closer is now one of the UK's biggest-selling weekly magazines but continues to evolve to stay ahead of the game. To move the brand on further, we have decided to appoint a new agency to bring fresh perspective to the challenges Closer faces in a dynamic but cluttered weekly market."
In the latest Audit Bureau of Circulations figures, Closer jumped into second place in the celebrity market, leap-frogging its sister title, Heat, and IPC Media's Now. The title recorded a circulation rise of 7.1 per cent from 540,044 to 578,337.
Matthew Robinson, a director at Team Saatchi, said: "It's a fantastic opportunity to be working with Emap and we're thrilled it values our unique offering. We are looking forward to building on the Closer magazine success story."
Media planning and buying will continue to be handled by OMD UK, which works across Emap Consumer Media's portfolio of titles.
Team Saatchi is the second agency this month to be awarded a magazine advertising brief by Emap. Fallon recently landed the £10 million creative account for its new women's weekly, codenamed project Jackie (Campaign, 17 March). The title will target women in their mid-thirties who are less interested in the celebrity gossip of Closer.