SPAM on 1 article

Hey all,

My weblog has a lot of visitors and sometimes I get an comment from a person. But almost every day I get around 10 SPAM comments!
The strange thing is that 90% is on the same article

http://blog.stefansegers.nl/2008/09/fashion-shoot-met-marina/

Is there something wring with my article? How can the SPAM plugin automaticly delete all these spam messages? For now I need to click CHECK SPAM

hope to hear from you

Stefan