Campbell, who co-hosts the family reunion show with Davina McCall, tweeted this morning: "Long Lost Family recommissioned for series 3. The work begins."
Production company Wall to Wall's chief executive Alex Graham supported Campbell's statement, adding: "Long Lost Family ends its run with strong numbers. Thanks @NickyAACampbell and @ThisisDavina for another brilliant show. See you on series 3."
Though ITV could not confirm that more episodes have been ordered, the broadcaster has been advertising for contestants to apply for next year, with auditions taking place between April 1 and May 31 2013, suggesting the third run will play out in the autumn.
Long Lost Family, which ended its second series last night (May 31), has been in formidable ratings form for the last seven Thursday nights - never falling once below 4 million viewers.
The emotional programme's first run aired in April 2011 to similarly solid audience figures.
Wall to Wall also produces BBC One's successful family history format Who Do You Think You Are?, which began in 2004 and has now been sold to several countries from the US to Norway.
Long Lost Family was originally given the green light by factual and daytime director Alison Sharman and controller of popular factual programming Jo Clinton-Davis.