my ds2 did just like yours, except we both forgot to nurse one last time on his b-day! thats how nautral the progression toward non-nursing was. LOL we had our last nursing about a week or two later and that was 2 yrs ago.
i wasnt brave enough to have a weaning party, since even my extended-nursing friends think i am weird, but if theres aever a dc3, i think i will go for it.
happy weaning, mama and son!