The Northern & Shell-owned title sold an average of 599,847 copies between January and June this year, up 18% on the period, but down 1.2% on the year.
Melanie Danks, head of trading at Northern & Shell, pointed to a string of exclusives at OK!, such as the coverage of the wedding of Westlife band member Kian Egan.
Closer recorded an average circulation of 530,371, up 0.6% year on year, but down 1.8% on the period.
Sister Bauer title Heat retained third spot across the celebrity sector, registering an average circulation of 445,192 in the period, down 5.3% on the year, with a fall of 5.4% on the period.
OK!'s rival Hello! sold an average of 397,634, down 6.9% year on year and 6.1% on the period.
Hello! remained behind Northern & Shell's New!, which recorded a circulation of 400,189, but ahead of Desmond's Star.
NatMags' Reveal had something of a revival with its circulation lifting 14% year on year, to hit an average of 315,660.
Media Week revealed earlier this year that the first of three of the Jade Goody and Jack Tweedy wedding issues, recorded a circulation of 1.8 million, in a combination of news-stand and subscription sales.
Goody struck a deal through her publicist Max Clifford with the Desmond-owned magazine, worth an estimated £700,000, for exclusive wedding photographs.
OK! came in for criticism in some quarters for its coverage of the death of Michael Jackson, which some people claimed was gratuitous.
Full analysis of all the main magazine sectors will be included in the ABC supplement with Media Week's 18 August issue.
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