WPP, headed by chief executive Sir Martin Sorrell, reported worldwide revenue growth of 1% over the first five months of the year.
The group said all regions were showing strong growth in 2007, with the exception of the UK, where revenues were up just 3%.
In the US, WPP reported revenue growth of 8%, Continental Europe was up almost 6%, Central and Eastern Europe was up over 12% and remaining markets including Asia Pacific and Latin America were up over 11%.
WPP said: "2007 has seen further continued growth in revenue, profit and margins, following the record performance of 2006."
The company announced its offer for 24/7 Real Media has been cleared by the regulatory authorities in the US and Germany.
News of the £329m acquisition first emerged last month. WPP bought the New York-based company to boost its digital media and marketing credentials.
WPP also revealed plans to target a 20% reduction of its global carbon footprint -- which it calculates to be 260,000 tonnes of CO2 a year -- by the end of 2010.