In 2007, she played the newly launched Park Stage at the Glastonbury Festival, replacing MIA who had cancelled. During the festival she reunited two members of The Specials, an act that guitarist Lynval Golding claimed played a "massive part" in the group's 2009 reunion. She also sang the vocals on the top ten single, "Oh My God", a cover of the Kaiser Chiefs song by Mark Ronson. On 1 July 2007, Allen appeared at the Concert for Diana held at Wembley Stadium, London to celebrate the life of Princess Diana. She sang "LDN" and "Smile". Allen's single "Littlest Things" from her album produced by Ronson, helped earn him a "Producer of the Year – Non Classical" 2008 Grammy Award. She also provided background vocals to a couple of songs on the Kaiser Chiefs' third album in 2008. Allen won a 2008 BMI songwriting award for "Smile".